English bloke - The NFL probably gets better coverage in the UK though than rugby does in the US.
There are 3 live games a week on during the regular season, Sky Sports are showing every playoff game (2 last Sat and 2 on Sunday and same this weekend).
So given that the major sports broadcaster in the UK are showing the games, then it's not an unreasonable question for someone to ask of pubs that may show it. It's not going to be widely available in pubs because most customers won't want to watch it (particularly if it's opposite a football or rugby match) - but again it's not unreasonable for someone who will be in London to ask because there will be a market for it.
DW likes NFL and baseball, as do I, so we have the TV package that allows us to watch these.....however she has also picked up on English football, she doesn't watch as many games as I do, and not every game interests her but she is making the effort to learn about it because she knows how much I like it. She's also planning a BBQ/party for the England v USA world cup game!
GO SAINTS!