Here in the Wirral, Hometyre vans to fit tyres at home seems to be quite common. I will need to replace all 4 General Grabber UHP 275 X 45 X 20 soonish.
Hometyre on their website offer the Hankook RH06 XL 109V at £140.30 fitted inclusive of vat. (275 x 45 x 20VRH06XL).
This seems pretty reasonable for my RRS TDV8, unless you know better. I am ex warranty, but I've had 45 profile on for the past year during the warranty period, and had no dealer issues. I far prefer the 45 profile and the speedo reading seems to be accurate judging by when you get flashed by one of the mobile non penalty speed advisory units. In fact, I wonder if I could go for 50 profile on a 275 x 20 tyre?!