There's a work-around: You call the flying school at the western end before you fly and tell them you'd like to visit:
Then tell ATC inbound that you're visiting the flying club and request taxi to the flying club where you can get a cup of coffee, fuel and pay a reduced fee.
Sadly this is not widely publicised.....
(Have to say I've never done this so can't tell you the name of the flying club, but some one wiser than me who is Norwich based will be along in a minute)
PS the £50 often quoted is I think the minimum charge if an invioce has to be sent: Actual charges paid on the day are a bit less: New management has taken on board the antagonism to GA by the old regime and is actively trying to woo GA by better charges.
Though they haven't managed to woo me yet and I'm based not far away........