Entrance Closed

I arrived at West Hampstead Thameslink station on my way home this evening to find the entrance hall closed, and everyone was being directed through the emergency exit. Apparently after a little rain (compared to yesterday) they had declared the floor too slippery. I can confirm that after yesterday's downpours the floor was exceedingly slippery, why it wasn't necessary to close it yesterday I don't know, I can only guess that someone slipped and was injured either late yesterday after I had gone through or at some time today.

Whoever specified the tiles for the floor didn't think it rained much in London as they are treacherous when wet.