Alistair and I will be walking from Hampton Court Bridge to Battersea Park. All in one go. In the middle of summer. It's around 20 miles and is expected to take around 6-8 hours. One of us is fit, healthy and raring to go.

The event is in aid of Envision, a charity that helps young people make a positive difference to their lives and their communities. Envision is also one of Pier32's regular customers.