Celebs on the tube

In November 2012, the unmistakeable tones of Barbara Windsor could be heard over the tannoy, as she encouraged Tube passengers to give to the London Poppy Appeal.

In 1999, Tony Blair was filmed taking a trip on the Tube. Laughing, he apologised to a fellow passenger about the disruption, as he was snapped by photographers.

In the good old-fashioned style of Tube passengers throughout the ages, she ignored him.

Kim Wilde caused a Twitter sensation when she was recorded on her way home from a Christmas party singing her hit "Kids in America" in December 2012.

Credit: Katherine Eames on YouTube

In October 2011, commuter Lisa-Marie O'Keeffe was excited to spot a familiar face on the Tube. Rihanna was on her way to a gig at the o2. She said the star was telling excited fans to "hold on tight" and was "being very motherly".

Another commuter, Adrienne Amando, said Rihanna was with her minders and manager, saying "she was so gracious and so humble and so lovely, it was wonderful"

Sanyogita Mayer, 27, was travelling on the tube with her husband Yanko and their daughter 16-week-old Sayama in October 2011.

The family were travelling on the Eastbound Jubilee line train at about 11am when David Cameron got on at Westminister and complimented Sanyogita on her beautiful baby.

Sanyogita had no idea who he was and said to her husband in front of Cameron: 'Who is this man telling me my baby is beautiful?'

Yanko told her he was the Prime Minister.

Sanyogita thought it was a joke and asked Cameron who he really was. He insisted that he was indeed the PM.