Brexit: ‘This affects all parts and all people’
Media playback is unsupported on your device
Video

Brexit: ‘This affects all parts and all people’

Theresa May has signed the letter triggering Article 50 and the formal process of leaving the European Union begins.

Lord Gus O'Donnell told the Today programme that in order to get the deals the UK wants we will be forced to give something in return. He said the UK is in "a plane flown by EU member states," about to jump out and they've "designed the parachutes".

Go to next video: What do school children think of Brexit?