A word of warning: The address they use for receiving your normal mail is a box number, but financial institutions and the tax man don't like that. For those, you need a street address, so if you go with Ship to Shore, ask Lindsay for permission to use her home address.

I used http://www.shiptoshore.co.uk/ , an agency which is precisely aimed at your need. They will hold mail and do anything else you ask of them - Contact Lindsay Trotter - and please mention my name, it may get me some brownie points!