The polls, which would never go ahead in Britain if the United Kingdom (UK) had managed to pass a withdrawal agreement in the parliament within two previous deadlines, will send 73 new British members of the European Parliament to Brussels.
The election came a day after Prime Minister Theresa May received mounting calls to resign since she has revealed a new offer to move on with Brexit.
British voters will elect today 73 Member of the European Parliament (MEP) in England, Scotland, Wales and Northern Ireland.
The newly-founded Brexit Party is expected to win most of the votes and the establishment parties, the Conservative and Labour parties have lost support due to Brexit failure, according to latest opinion polls.
Approximately 374 million voters will cast their votes across the European Union (EU).
Results will be due after all EU nations complete the voting process at 2100 GMT on Sunday, May 26.