I can't find the original tweet, but this story is doing the rounds even now (from a tweet):
"It’s not often the London Fire Brigade turns up to a book launch party. Last night it was called out to bash a door down at Conville & Walsh offices in Soho as a guest had locked themself in the loo. The party was to launch S J Watson’s debut novel, Before I Go to Sleep..."
With thanks to the Evening Standard's Londoner's Diary for the quote.
The bad use of English & grammar in that quote are not mine. (Offers for edit & proofreading gratefully accepted.)