IO540
You are not discribing the Gatwick that I know with , being cleared to land at 200ft on a regular basis and 100ft now and then I think that squeezing GA in would be quite hard as much as it would like it to avoid the commute around the M25.
The more that I fly IFR the more I like Visual approaches................. Big jet, small Greek island & visual approach from 10,000 ft........... now thats what I call fun!!