We get the Super Bowl on terrestrial for like, half a bloody day once a year, ( What's with that? Enough with the time-out ad-breaks every 2 minutes FFS, just get on with it already. HowTF does 60 minutes turn into 5 hours worth of TV? Answer is: it doesn't. Not in a way that's all that watchable, anyways. ) on Channel 4 once a year. They used to put the NFL season on with a seriously late night / early morning weekly show but that was years ago. Can still get it, but not on regular terrestrial AFAIK?
There is a bit of American Football played at grass roots level, but it's not commercially viable by any stretch. We tend to frown on it in the U.K. TBQH. It's a lot like Rugby Union / Rugby League, but our fat fuckers from public schools / pit villages ( depending on what code is being played. ) do it with none of that helmet / body armour shit to help 'em out. It's every bit as brutal, if not more so. You're all American pansies as far as Rugby fans are concerned!