Thank you to everyone who sponsored me. A venerable mixture of work colleagues, Who fans, LibDems and assorted friends took the total raised to over £250.

The walk itself was a bit of a trial. In principle, walking 10km should have taken me under two hours and been quite relaxing. Three factors mitigated against this though:

• Walking with over 4,500 other people, at the speed of the slowest.
• Carrying my rucksack.
• Wearing black as the temperature reached 33°C.

On the plus side, we did finish in the end (two-and-three-quarter hours after starting), at which point we took our rewards – a copy of Heat, a drink and three Bourbon biscuits – and retired to Jubilee Gardens by the London Eye.

Although I look cheerful in the photo, my legs were killing me. They’re much better now although still a bit painful. But, hey, it’s for charity…