Steve,
If you called Williams recently they were short staffed as the boss is on his honeymoon! Henry is the main phone responder. There are only 4 main people who deal with customers:
Henry, the Boss
Paul, Sales
Mike, Workshop
Elles, Rental and events
Big Boss Richard helps, but isn't there all the time.
I know they are very busy in the Workshop, the best way to get Mike to squeeze you in is to go there during the week, drink a mug of tea or coffee and chat. Once they know you and put a face to a name the service seems to improve.
Given the level of mods made to the car they will be interested. Laurie, a.k.a "Chunky 4/4 Racer" and their head technician will be fascinated...
Oh, watch out for the spaniels. They just look at you and you have to spend money.