NFL is shown on Sky Sports - 2 live games each Sunday and Redzone on interactive. (Also Thanksgiving games, Thursday night games when they start up). Sunday night football is usually on channel 4 and Monday Night Football last year was on Eurosport.
I like the Sky coverage as they will vary who are on and, whilst I'm a Saints fan, I like to watch other teams so I know how everyone is playing. I hate it when in the States and I'm stuck with whatever the local team is.
Also, as stated though you can go for Gamepass, although any games that are on Sky Sports are blacked out on Gamepass and I also believe that the playoffs may be as Sky Sports show all the playoff games.