I don't want to get too carried away with the London mayoral theme, but YouGov asked a fantastic question of voters recently. Which of the candidates would you feel most confident would repay you if you lent them money?
24% opted for the incumbent, Boris Johnson, 18% for former police commander Brian Paddick and just 17% for the former mayor, Ken Livingstone. A whopping 26% couldn't envisage their cash being returned by any of the leading contenders.
My personal view is that bumbling Boris would intend to give the money back and be quite well intentioned, but would almost certainly forget. When prompted, he'd look concerned and promise to take you out for a slap-up meal at some unspecified point in the future.
Paddick probably wouldn't accept your loan without a lot of paperwork to document the transaction.
Ken would refer you to his accountant.