For anyone in North Surrey, I visited Hardys of Hampton with my Gransport. I had a very good experience and a nice video of their investigation.
James & Alex are brothers who grew up locally and went to school on the area. They are very experienced with the mechanics and did the maintenance to my f1 pump and replaced the transmission fluid.
They also look after a members 3200 which is how I found them.
https://www.hardys.co