Of the garages I've asked, the cheapest wanted £20 per wheel for fitting, balancing and valves. That seemed expensive for - £80 - For 20 minutes work. Many don't want to do it full stop.
Appreciate its because their profit was in the tyres, but happy to be told different.
It has always been the same when I've shopped around.
The money you save buy buying "just the tyres" is easily eaten up by the fitting charges afterwards.
Etyres will come to you and fit your own tyres - but they want rim size + VAT.
Most garages seem to want about £20 per corner at least.
I'm about to get myself a couple of Conti SC5's and it looks like Black Circles will offer me the best "no hassle" price - so I just drive to their local "premium fitter" about 4 miles down the road and they will fit them for me, all included in the online price.