Firstly, I wouldn't look to the Fieldsports channel as a reliable source of information on Shooting in the UK.
For me it would be like saying I watched the dukes of hazzard and all Americans drive around in orange dodge chargers.
It seems to me though that all our rifles and shotguns are a lot more expensive over here, for fullbore rifle's £600 is the cheap end of the spectrum, and really the sky is the limit after that.
Tikka would be a good popular brand, coming in at £1000 to £1500 ish depending on what you want.
Then you could spend any figure on a custom rifle, 10's of t