In pictures: Celebrations and protests - how the United Kingdom marked leaving the European Union

From dressing head-to-toe in Union Jack flags to lighting candles and protests, here's a look at how people across the four nations marked 11pm - as the UK officially left the EU.

• Pro-Brexit supporters celebrating in Parliament Square at Nigel Farage's leaving party

• 'Thanks Nige': National flags and anthems in Parliament Square as pro-Brexit supporters celebrate the joyous moment

• A pro-Brexit supporter celebrates by jumping onto an EU flag in Parliament Square

• A message reading 'this is our star, look after it for us' being projected onto the side of the White Cliffs of Dover

• Union Jack flags all around in Belfast as pro-Brexit supporters celebrate the UK leaving after 47 years

• 'Missing EU already': Pro-EU campaigners take part in a rally outside the Scottish Parliament, Edinburgh

• Border Communities Against Brexit campaign group protest on the Irish border in Carrickcarnon

• Pro-Brexit supporters gather in George Square, Glasgow, as the UK leaves the European Union

• A pro-Brexit supporter celebrates by pouring beer onto an EU flag in Parliament Square

• 'We still love EU' appears on a cliff in southern England

More on Brexit here:

• Beyond Brexit: What will change after the UK leaves the European Union?

• Beyond Brexit: Fishing, farming and science set for biggest shake-up in 70 years

• Beyond Brexit: Why young European talents won't be snapped up by British clubs

• Brexit day in pictures: The final countdown

• Why we'll still be talking about Brexit until the end of 2020