People complain about the high charges at Waltham, but one of the things the charges pay for is the team of "Donglers". These are cheery South African blokes who pump fuel, mow grass, cut tangled corpses from smoking wreckage, and move aircraft in the hangars. Members are not allowed to move hangared aircraft. OK, aircraft still can get damaged, but the club pays for the repair.
As for leaving a note, virtue is, of course, its own reward, but many years ago when I was an obnoxious yuppy, leaving a note on the Fiat Panda I had just trashed whilst ineptly parking my Bimmer led to surprising and not altogether unpleasant results.