Irish carrier Ryanair has made no secret about the fact that it wants Britain to stay in the European Union in the upcoming referendum.

It has launched a Brexit seat sale, to help more than 1.2 million Brits living abroad to fly home to vote tomorrow.

While it also unveiled some of its planes carrying a 'Remain in EU' message for British voters.

But today in London, CEO Michael O'Leary made his position absolutely clear.

Wearing an outfit that looks like it belongs in a pantomime, he jumped around opposite the British Houses of Parliament.

Ryanair CEO Michael O'Leary in London | Image: Ryanair

He is also pictured holding up a Union Jack Flag alongside two Ryanair members of staff.

O'Leary with cabin crew Petra Kasikova and Ashley Duggan | Image: Ryanair

Polls open in Britain at 7.00am tomorrow, while Irish citizens aged 18 or over who are resident in the UK are also eligible to vote.

Results are expected across Friday morning.