Our local Morrisons has an underground car park with a sign that said 2.10m. The architect, being a smart arse, had specified low profile florescent tubes and integrated wiring; the store being cheap, used standard lighting tubes, fixings and surface mounted wiring in badly bent conduit. The architect specified the height signs and the store just installed them.
Day 2 after collected my newly rebuilt LR110CSW with heavy duty rear springs and being 2.01m tall, (actually measured with a real tape and spirit level), went down into the car park with Mother In Law to do her shopping. Nasty scraping noises and the lighting makes firm contact with the top of my roof. Summonded the store duty manager, who takes pictures and makes something of a grovelling apology, giving me details of the store liability policy. I did not claim as the damage to my truck was minimal.
3 months later, HQ send me a bill for repairs to the lights and the wiring, which I send to my solicitor, to send them a rude letter explaining their problem. They send me an apology for troubling me and the signs get taken down, never to be replaced, (this all happended 11 years ago).