I'm not sure how useful this review is apart from for anyone who lives near the test sites.
At my home the winners would be O2 and Vodafone. I have no 3 or Orange coverage and very limited T-Mobile coverage. At work the winners would be O2 and Vodafone and 3 - no Orange or T-Mobile at all. Again this is totally useless information to everyone - except my neighbours and work collegues.
Plus the coverage maps are a waste of time as they are rarely accurate.