It is possible to fly in to Vallance Byways, the small museum airstrip just north of the western threshold of the main runway. It's a shortish grass strip, but Peter Vallance is very friendly and helpful. You can do it on a VFR clearance (it's class D airspace). You will need a transponder and PPR from the airfield. The museum is worth a look around anyway and Peter needs all the support he can get.
Besides it's great fun flying a Permit aircraft in to LGW, the rout from the east is over the top of the North Terminal. Contact details in the latest Lockyears.
Safe Flying,
Richard W.