Most popular brands in the Uk (not in order)
Daysate
Air Arms
Weihrauch
BSA (owned by Gamo)
Walther
Brocock
Webley
With a smattering of Gamo,Benjamin,FX and others.
I would say Weihrauch Spring powered air rifles dominate that genre.

As I said before,the UK air gunners are very serious about their sport.

I don't know if they go after much game with the air guns but I see that they do a lot of "ratting". Probably pigeons and starlings as well.

Wayne