Only when chasing Spitfires 
Low level throught Heathrow is still available, safe enough and with some good scenery.
Can you tell me (well, us) more? I really thought going anywhere near LHR in ANYTHING that isn’t a turbine twin+ or heli was a total no-no. I’ve flown SVFR through their airspace, but just touching the fringes on a flight from White Waltham to Stapleford.
LHR airspace is Class D now (used to be Class A few years ago with old UK PPL SVFR you need +100km visibility and +10km from clouds ), transiting Denham to Fairoaks while saying west of M25 is still doable at 1000ft with VFR clearance from Heathrow Radar 125.625, I don’t think there is much “glide clear” issues around that area…
