Watch David Cameron's final speech as Prime Minister in full

David Cameron leaves Downing Street for the last time as he heads off to see the Queen with Samantha and his three children. Get the latest headlines: http://www.telegraph.co.uk/ Subscribe: http://www.youtube.com/subscription_center?add_user=telegraphtv Like us on Facebook: http://www.facebook.com/telegraph.co.uk Follow us on Twitter: https://twitter.com/telegraph Follow us on Google+ https://plus.google.com/102891355072777008500/ Telegraph.co.uk and YouTube.com/TelegraphTV are websites of The Daily Telegraph, the UK's best-selling quality daily newspaper providing news and analysis on UK and world events, business, sport, lifestyle and culture.