The survey also looked at some of the strange objects left behind in cabs around the world, they include:
- A wig and a bird in a cage left behind in a US cab
- A prosthetic leg and an ex-boyfriend left in an Australian taxi
- A trombone in Finland
- Dentures in Germany
More top news
His top speed is believed to be the highest ever recorded in the UK by a rider carrying a pillion passenger.
The mayor took time out from City Hall to join Conservative party workers handing out leaflets in Uxbridge and South Ruislip.
No matter where you look, London's population is getting older - with the exception of one of the capital's boroughs.