I've used Motorserv UK for both my old and current model S and been totally satisfied with their service. First time there was a spacing error of 10mm between two of the letters on my personalised reg, second time I needed two new tyres - my fault for not checking I suppose. Both times no charge for first test. Arranged a retest as I left from the 1st and passed. One charge of £15 in June '22, can't remember first charge. Their details are:-
Unit 26
Monkspath Business Park
Solihull
B90 4NZ
Definitely recommend