Birdlady,
I dont mean to be rude, but are you incredibly lazy? You seem to keep posting regarding information freely available in LASORS, or on the relavent CAA forms. You want to know where to go in Gatwick for a Class 1 medical?
Most probably to the CAA building?
And when you book ask them if you don't know where Aviation House is. I'm sure they will tell you.
A little bit of initiative goes a long way in this business.