Apron G is the nearest but still at least a 10 to15 minute walk, that's where the GA a/c that use the Handling Agent park usually so not sure they'd be keen on you parking and just dropping off there, next nearest apron is the Flying Clubs apron (Apron P) but you'd need a member (if there are any about) to let you through the gate and then the Clubhouse, even further away is the Flight Centre on Apron E and there's usually someone there 9-5 but unless you phone a taxi or cadge a lift it's a good 25 min walk.