From: http://news.bbc.co.uk/1/hi/uk_politics/7523144.stm:
Conservative leader David Cameron says his bicycle was stolen after he left it locked outside a supermarket while he shopped near his home in west London.
He was at a Tesco branch on Portobello Road when the bike - which he joked was "an old friend" - disappeared.
"Someone must have picked it up and walked off with it," he said.
[...]Tom Bogdanovich of the London Cycling Campaign said he hoped the theft would not discourage Mr Cameron from using his bike.