Gonzo
The 'wingtip clearance not assured' message is at the behest of AAIB.
So I guess the AAIB and others are just happy to shift the blame rather than fix it - I can't see my wingtips so I guess as I taxi out/in if I hit something then I had been told ! Rainy nights are always fun moving around LHR
UK at its best
As I mentioned, perhaps time we all refused to move the aircraft if clearance is not assured