Admins: I figured this was probably the best place for this, but feel free to move it if you want to
For a while, I have been saying that the Pellet Grill market is limited in the UK. It certainly was when I was making my purchases, but it seems like, while I wasn't paying attention, things have gotten interesting.
The following grill manufacturers are now available from UK retail outlets (either online or brick-and-mortar). I'm not listing links, but just knowing a grill is available should make a search trivial.
Green Mountain Grills
Cookshack/Fast Eddy's
Traeger
Louisiana Grills
Rec Tec Grills
Pit Boss
I think that is a pretty healthy market, it looks like it is a growing thing.
While I am posting, these are the pellets I know to be available here in the UK.
Green Mountain Grills
Cookshack/Fast Eddy's
Lumberjack
Traeger
Louisiana Grills
CookinPellets
If I have missed anything that you know is available for retail in the UK (i.e. not involving the purchaser importing from the US), please let me know.