It's a while since I donated, but they do not seem to do many local sessions. At some previous places I worked they would collect you by bus or even bring in a mobile unit. They ought to do that at the current place as a lot of people work there.
A Club is a good reward. Used to be bourbons or custard creams.
The mobile van would certainly be more efficient, no tea though!
They advised me to book my next appointment NOW - it's that popular! Apparently because they've closed local centres so now the remaining ones are in demand!