I was on a VLM flight also due to arrive about 18.50 last night, and already delayed an hour due to ATC restrictions, and arriving in the London area we were put in a hold for about 30 mins as the captain told us LCY was closed due to a 'fire alert'. I guess there was a bit of confusion as to which flight was arriving when around that time as they sorted the arrivals out so that might explain the problems with the arrivals board, had to wait a few minutes for a stand to become available as well, but that seems to be usual for that time of the evening.