I recall that when this came out last year, it got decidedly mediocre reviews, but I thought I'd give it a try when it turned up on TV last night. A lot more fun than I expected. The writer had a sure understanding of the genre - the written genre, not the usual film or TV genre. It didn't rely on blockbuster special effects. It was plot driven, and although not a stunningly original plot, they handled it well. OK, they couldn't really decide how to end it, and the final scenes got a bit silly (or sillier) but it worked up to them finally leaving the pub.
I could see this as a short story in a British SF anthology.
I could see this as a short story in a British SF anthology.