Nicely put!
If you go to MyTyres ( http://www.mytyres.co.uk/ ) you can select all-season (or Summer, or Winter as you will) tyres from thier list, then from the tyre details page you can click on tyre reviews. What reviews are available depends on who, and whether, the tyres have been tested. If tyhere are no tyre reviews (or poor ones!) then don’t bother with the particluar tyre. I think tyretest.com is reports from people who have actually used the tyres, as for the rest it helps if you understand German! But you can always google tyre reviews for the tyre you fancy.
If, when searching, you check the “fully fitted” box they will give a list of local fitters, What you then do is ring them up directly and ask a price for your selected tyre - I’ve saved a fortune this way!