Service Stations

Hi, we're totally new to owning a Motorhome and living in central London and due to the emissions policy we park our Motorhome at a long stay Gatwick airport car park. We are looking for a Motorhome service centre where we can go to for the likes of MOT's , repairs, services, alterations etc in the SE but outside of London - any idea's ? As a bonus we are also seeking to find also new car parking / storage facilities again any idea's?

Any advice most welcome.

Cheers P