Student or you have two addresses
If you split your time between two addresses (so for example if you are a student and have a home address and a term-time address), you can register to vote at both addresses, as long as they're both not in the same local authority area.
At local elections, you can vote in both places. At national elections, such as a parliamentary general election or European election, you can only vote in one place but you can chose which place you vote in. Voting in more than one place at national elections is a criminal offence.