I used Lydiard Service Station in Lydiard Millicent just outside Swindon in Wiltshire (http://www.lydiardservicestation.co.uk/). They did a through and fair MOT for me on my Bay. I'd recommend them and will definitely go back next time.
Grays Uxbridge rd West Ealing Luke from Terry's beetles sends all his work for mots there. Always been good to me.
Autocare Chester (in the railway arches by the Roodee). Looks ropey as, but top blokes, very pragmatic.
Swan Autos Colville Road Acton W3 8BL Always been good for me, I get my Bay and my T25 done there, was recommended by my mate who has had classic VWs for years and he knows the owner.
Station Garage, Bishop's Stortford, CM23 5NF Jamie has been fettling Aircooled VWs for ever. Nice guy, great team, very helpful.
Wessex MOT Centre. East Lydford Somerset. TA11 7HA Both owners are over fifty and have been looking after classics all there lives. The testing station also has the advantage of flat bed brake testing. NO ROLLERS. Basic price was £50. Apologies if this one has been done before. Very understanding and helpful.
Rampton Motors 8 The Green Rampton Cambridgeshire CB24 8QB Just put mine through and they are ‘proper’ mechanics.
I have been going to Burnaston Garage just outside Mickleover in Derby for ten years and they are great. Really understanding and helpful and I wholeheartedly recommend them. Proper old school mechanics. Address is Burnaston Garage, Etwall Road, Mickleover, Derby DE3 0BX