In reply to The Lemming:
After retiring at 65 I had no difficulty getting part time jobs, so long as you recognise that you are not going to earn mega bucks, but certainly a nice top up to your pension.
I've had the following jobs over the last 4 years (all part time):-
Ipsos-Mori Poll Interviewer
Go Ape Instructor
Key Accompany viewings man for local Estate Agents
These have all brought me in enough money to enjoy a 3 or 4 good overseas holidays a year without breaking into my pensions, and there has been the potential to work longer full time hours if I had wanted to.