There is the small museum strip 550m x 10m grass, to the north of the western (08) threshold. Details are in the latest (4th Edition) Lockyears. I was last in there in August ‘03 and Peter Vallance was having problems with local NIMBYs. I’m not sure of the present status, but the website below indicates that it’s still operating. It is well worth a visit if anyway.
http://www.gatwick-aviation-museum.co.uk/
Safe Flying,
Richard W.