How does Hertsmere vote?

Our constituency has only ever had three MPs: a Thatcher ally removed after he turned out to be quite possibly the greatest heel in Tory history (in a competitive field); a diligent but unremarkable backbencher, ejected to make room for a SPAD on the fast-track; and the SPAD himself

Chart showing election results in the Hertsmere constituency between 1983 and 2024. Full data at a link below the chart.
Voting in the Hertsmere Parliamentary constituency from 1983 to 2019 (full data)

This post has been updated to reflect the 2024 general election result and the polling data in this spreadsheet now includes every election in Hertsmere between the creation of the constituency in 1983 and 2024.

The chart shows 41 years of Hertsmere General Election voting, from the Thatcher high water mark of 1983 (the biggest landslide since Labour’s 1945 win) to 2024’s national Labour landslide, via that other high water mark – Blair’s even bigger 1997 landslide.

The Hertsmere Parliamentary constituency has only existed since 1983. Before it there was a constituency called South Hertfordshire that itself only lasted for three general elections. Cecil Parkinson was Hertsmere’s first MP. He had entered Parliament in the 1970 general election that brought the Conservatives under Edward Heath to power. Parkinson became a close ally of Margaret Thatcher and joined her cabinet in 1979. He moved to the new Hertsmere constituency for the 1983 election (the ‘Falklands election’), when he also ran the successful Conservative election campaign. He resigned later that year, after a particularly grim scandal and, although he had returned to the cabinet in the meantime, stepped down again on the day of Margaret Thatcher’s resignation and left the Commons in 1992 (ennobled, of course), to be replaced in Hertsmere by James Clappison, who went on to be a popular and hard-working constituency representative – always a backbencher – for five Parliamentary terms.

Clappison was summarily dumped by his party – one of those brutal ejections that the major parties are fond of, for the 2015 election. History records that our constituency very nearly became home to one Boris Johnson. In the event, though, Johnson was installed in Uxbridge and South Ruislip and we got David Cameron adviser Oliver Dowden instead. Dowden featured in Cameron’s now-infamous 2015 dissolution honours list – that’s when he acquired his CBE (people think it was Boris Johnson who invented the shameless advancement of pals and nonentities. Not true).

Dowden’s progress

Once elected, local boy Dowden became a hard-working constituency MP, visible in the area and always ready to support local causes or to make a speech next to a bin. He’s had an interesting few years, first promoted to a junior ministerial role by Theresa May (in the same reshuffle that brought another Class-of-2015 rising star, Rishi Sunak, into government). Dowden was Paymaster General.

Boris Johnson promoted Dowden to the top job in the Cabinet Office, where his portfolio expanded to take in everything from cybersecurity to propriety and ethics to public appointments and Chinese spooks. His period as Culture Secretary took in the pandemic and a bail-out for theatres and art galleries. For some reason he also saw fit to take on the fraught matter of stolen artefacts in British Museums – opposing the deals being done by some curators with countries of origin and even suggesting using the law to prevent returns. This was puzzling because polling suggests that most Britons think artefacts like the Parthenon marbles ought to be returned. Moved to the holding position of Co-Chairman of the Conservative Party he took up the Culture Wars with a vigour that some found surprising. In that period he famously endorsed privet hedges and took up arms against unisex toilets and woke road signs.

Boris Johnson and Oliver Dowden jumping
Johnson and Dowden jumping

For a second-tier politician, Dowden’s always been pretty close to the action (once a Number 10 staffer, always a Number 10 staffer). He was first to endorse Johnson to replace Theresa May but also first to resign as Johnson’s final crisis began. Joining #TeamRishi was another low-key masterstroke for our operator, although his return to the front bench was delayed by that weird 49-day Liz Truss thing, during which Dowden was very much on the outside (we learn that he was partying with at a hotel in Leicester Square the night before Kwasi Kwarteng’s dismissal. Schadenfreude, much?). Ultimately, of course, Sunak was choppered in by the membership and Dowden’s (quite short) period in the wilderness was over. There was some speculation beforehand that he might not stand in 2024, which could take place no later than 28 January 2025.

Dowden, survivor

Reader, he did stand and he is still our MP. In Parliament he presently occupies the uniquely pointless role of Shadow Deputy Prime Minister. On the day of the 2024 election – half an hour before the polls closed, in fact – it was announced that Dowden would become a Knight Commander of the Order of the Bath (KCB) in Rishi Sunak’s own dissolution honours. To his credit he remains a diligent and accessible constituency MP and one who is largely in touch with the concerns of his constituents: active regularly on the Israel-Palestine war, on green belt and development issues and on public transport, so important in this commuter-belt constituency.

In an unexpected twist, we learnt the other day that he’s been interviewed by the Gambling Commission about the rash of betting on the date of the election that preceded Rishi Sunak’s May announcement. He’s keen to point out that they’re not investigating him, though – it’s the others. Presumably, since his role at the time nominally covered propriety and ethics, he was asked if he’d observed other Tories entering a betting shop in the critical period.

Dowden, Kingmaker?

We’ve often written about Dowden’s apparent instinct for picking winners but, in the present Conservative leadership tussle, he’s been very quiet. His early endorsement of Victoria Atkins looks like it wasn’t serious and, anyway, Atkins had some kind of breakdown and then quickly disappeared from view before the contest had even begun. Since then he’s been scrupulously observing the code of silence that applies to the shadow cabinet. Do you know who Dowden is supporting in the contest? Leave a comment.

Three-quarter length portrait photograph of King Charles III, wearing the uniform of an admiral  with lots of braid and medals, in a corridor in one of his palaces

One thing we’ve been wondering about since the election is what happened to all those portraits of King Charles they couldn’t get rid of? It was Sir Oliver’s job to get them out onto the walls of the nation’s scout huts and council offices. During the election campaign he announced that a wider-range of organisations would be able to claim one of the roughly A3-sized framed photos – “hospitals, coastguard operations centres, job centres, universities, Church of England churches and other public institutions” to be specific. The scheme is now closed so presumably they’re stacked up in a warehouse somewhere. Could they not now be given to anyone who wants one? Have you actually seen one of these portraits hanging on a wall? Leave a comment.


The nitty-gritty

So, back to the elections. What all the results in our chart have in common, of course, is the winner. Hertsmere has been a comfortably Conservative seat for its whole history. Even the two Labour landslides, in which Blair’s party took 418 Parliamentary seats (still the largest number ever held by a UK party) and Starmer’s 411 couldn’t (quite) touch that. Corbyn’s surprising 2017 result, in which he secured the largest number of votes for Labour since that Blair landslide (and over three million more than Starmer in 2024) obviously didn’t move the dial. The Tories are as dominant in Hertsmere as they’ve ever been.

In some ways, the Liberals’ trajectory in the constituency since 1983 is the grimmest of all – essentially a steady fall from a quarter of the vote – and second place ahead of Labour – to less than half that and a poor third place. Among the also-rans, you can see the collapse of the far-right parties as their platforms have been absorbed by the ever-adaptable Tories.

This chart shows the Conservatives’ winning majority in Hertsmere, over the 41-year period. You can see just how close things got in 1997. It’s also interesting to note how long it took the party to recover from that enormous electoral shock – essentially a whole political generation.

Chart showing the Conservative candidate's winning majority in parliamentary elections in the Hertsmere constituency between 1983 and 2024
Full data

And this chart shows turnout over the same period, a pretty steady picture that puts Hertsmere a little above the 2024 average for the UK – although roughly in line with other constituencies with a similar, older-than-average, age profile. That little drop in the most recent election is telling, though, isn’t it?

Chart showing turnout in parliamentary elections in the Hertsmere constituency between 1983 and 2024. Full data is in a spreadsheet linked below this graphic.
Full data

To keep the top chart simple, we’ve left out the minor parties – the levitating transcendentalists from the Natural Law Party (please watch their amazing 1994 European Parliamentary election broadcast); James Goldsmith’s Referendum Party, whose programme looked pretty kooky at the time but now looks like a model of sanity; the Independent Communist candidate whose vote exceeded 2% back in 1983; Arthur Scargill’s Socialist Labour Party and the BNP, whose Daniel Seabrook ran once in 2010 before being rendered entirely irrelevant by UKIP (later rendered entirely irrelevent themselves). Also Hertsmere’s 2024 ‘Gaza independent’, Ray Bolster, whose 536 votes looks respectable alongside some of Hertsmere’s other fringe candidates across the years.

2024 was ‘the year of the MRP poll‘. This opinion polling technique, which involves a much bigger sample than ordinary polls and clever demographic weighting, was first used in Britain in the 2017 election campaign. There were dozens during the 2024 campaign – and they’re expensive to run, which tells you something about the feverish mood in the parties and the media – although perhaps not in the electorate. In January 2024, polling company YouGov published a big MRP poll – commissioned by the Daily Telegraph, projecting 385 seats for Labour. The result induced visible terror in Tory MPs and a frenzy of recrimination in the corridors and meeting rooms. We applied this result to Hertsmere. Predictably enough, although the effect was dramatic, our projection left Oliver Dowden in his seat:

Chart showing election results in the Hertsmere constituency between 1983 and 2019 plus data from a January 2024 YouGov opinion poll. Full data available in a spreadsheet linked below this graphic.
Full data

In fact, of course, when the time came, it would be even worse for the Tories. A string of other MRP polls, including this one, also from YouGov – the first to be made after Sunak’s election announcement – consistently gave Labour a huge margin.

The opinion polls largely missed the other big story of the election in Britain – the one that might turn out to be the most important in coming years: the fragmentation which produced big gains for smaller parties and independents. Parties that are not Labour or the Tories won a larger share of the vote in 2024 than at any election in the last 100 years. Only the first-past-the-post system is holding back a real explosion of political competition in the UK.

The raw data, including the smaller-party numbers not shown above, is in this spreadsheet, with the graphs, in case you’re interested, you weirdos.


  • Sources: Wikipedia, BBC and YouGov.
  • The detailed voting data for the whole period – plus the January 2024 YouGov MRP polling – is in this spreadsheet – the only way you’ll get all this data in one place.
  • The Wikipedia entry for the Hertsmere constituency is typically thorough and has some detail about the boundary changes which affected voting in the 2024 general election.
  • We saw one of Sir Oliver’s portraits of the king on the wall in a Fish & Chip shop not long ago. We wondered how they’d obtained it, since fast food outlets weren’t on the list of approved applicants. Apparently they’d printed it out off the Internet and bought a frame from Ikea. The resourcefulness and patriotism of ordinary British people on display there.
  • The MRP technique is significantly more accurate than ordinary polling but not infallible. YouGov’s 2017 poll came very close, predicting the hung Parliament and some of the outlier results but their 2019 polls were less accurate, underestimating the size of Johnson’s majority.
  • How do you get 1,116 votes for a Communist in a solidly Tory home counties seat? You give him the same surname as the winner. In 1983, the Conservative candidate and the Independent Communist were both named Parkinson.