Which constituency you vote in from abroad

You vote in the constituency that now covers your last UK address, not where your family lives or where you'd like to vote.

The short version

Overseas electors register against the last UK address where they were registered, or the last UK address where they lived if they never registered [1][2].
That address sets your council, your polling station and your constituency, and it's where your vote is counted [1][5].
Boundaries move. The current 650 constituencies came in at the 2024 general election [6][8], and the next boundary reports are due before 1 October 2031 [9].
You can't pick another address: not your parents' house, not a holiday flat, not a seat you fancy.
If you've never lived in the UK, you can't register as an overseas elector [5][3].

For the wider rules, start with our guide to voting from abroad and votes for life.

Why your last UK address

Most voters are registered where they live. You don't live in the UK, so the law ties you to the last place you had a real connection with. The Electoral Commission puts it simply: when you register as an overseas voter, you use the UK address where you were last registered, and that's where your electoral registration office is and "where your vote will be counted" [3].

There are two routes to that address, depending on your history [1][5]:

Your history	The address you use
You were on the electoral register before you left	The last address where you were registered
You lived in the UK but never registered	The last address where you lived
You left as a child and were too young to register	The address where you lived, with a parent's or guardian's details and your birth certificate [5]

So if you were registered in Bristol, then lived in Manchester for a year without updating it before moving to Madrid, the rule points to Bristol: the last address where you were registered. If you never registered anywhere, it's the last place you lived, so Manchester. When in doubt, the council you think applies can check its old registers for you.

Can I choose a different address?

No. You can't register at your parents' address, a UK property you own and let out, a friend's flat or anywhere you never lived. The declaration you sign says whether you qualify through past registration or past residence at that address, and it's a legal statement that the information is true [5]. If you're not sure which of two addresses counts, ask the councils concerned before you apply.

Boundary changes since you left

Constituency maps get redrawn, so the seat you remember may not exist under that name any more. The four boundary commissions (one each for England, Scotland, Wales and Northern Ireland) review them [7].

The 2023 Review produced new constituencies, which "came into being at the 2024 General Election" [8]. The UK still has 650 MPs, one per constituency [6][4].
By-elections use the existing map. New boundaries apply from the next general election after they're approved, so a by-election before then uses the old ones [7].
The next reviews must report before 1 October 2031, and then every eight years [9].

What this means for you: your address stays the same, but the constituency it sits in can change. A street that was in one seat in 2019 might be in a neighbouring one now. You don't need to re-register because of a boundary change. Your council places your address in the right constituency.

Councils change too. Some district councils have been merged into larger unitary ones over the years, so the council for your old address may have a new name. The postcode search tools below handle that for you.

How to find your constituency, step by step

Dig out the full postcode of your last UK address. An old letter, bank statement or council tax bill will have it. If you can't find it, Royal Mail's postcode finder works from the street name [10].
Find your electoral registration office. Enter that postcode into GOV.UK's "Contact your electoral registration office" tool [10] or the Electoral Commission's postcode search [3].
Ask the council which constituency and polling station your address is in if you're registered or registering. Only the council can confirm your registration [3].
Check your candidates nearer polling day. The Electoral Commission's postcode tool shows which elections are coming up, your polling station and who's standing. Candidates appear "a few weeks before polling day" [11][6].
Tell your proxy. If someone votes for you in person, they go to the polling station for your old address, which could be a long trip from where they live. That's when a postal proxy helps [2][5].

What your constituency means for how you vote

Question	Answer
Which elections?	UK Parliament general elections and by-elections; some referendums, depending on the rules each one sets [1][4]
Local, Scottish Parliament, Senedd or mayoral elections?	No. Registered overseas voters can't vote in other UK elections [4]
Where is my vote counted?	In the constituency of your registered address [3]
Can I vote at a British embassy?	No [5]
Where do I vote in person if I fly home?	At the polling station for your old address [1]

By-elections are worth a note. If the MP for your old seat stands down or dies, there's a by-election just for that constituency. You can vote in it if you're registered, using your postal or proxy arrangement, so keep your registration current between general elections.

When's the next general election?

There's no date yet. Parliament dissolves automatically five years after it first met (9 July 2024), and polling day follows 25 working days after dissolution, which makes Wednesday 15 August 2029 the latest possible date [12]. It can come sooner if an earlier election is called.

If you never lived in the UK

This is the hard edge of the rules. The Electoral Commission lists two conditions for overseas registration: British citizenship, and having previously been registered to vote or having lived in the UK [5]. If you're British by descent and were born and raised abroad, you don't meet the second, so you can't register as an overseas elector, however British you feel at the Sunday roast.

What can change that:

Moving to the UK. If you later live in the UK and then leave again, you'd qualify through that residence, at your last UK address.
Living in the UK as a child. Even a few years as a child counts as past residence. You register at the address where you lived, with a parent's or guardian's details [5]. Councils may ask for evidence, so school letters or family papers from that address can help.

If you're eligible but unsure, apply anyway and let the council decide. They're used to complicated histories.

Which constituency you vote in from abroad: your last UK address decides