IMHO opinion and not looking to start a bun fight, Richard is a very capable Subaru specialist having maintained my friend's S202 and my old Spec C type ra. Subaru4you, Engine Tuner and RCM would also be worthy of consideration.
I think it's more a case of who is practical for Koenig to get to, remembering he just want's a competent standard service.
There will be very few reputable Subaru specialists I'm not aware of, there will of course be some.
I know all of the companies mentioned here. All have been customers, Richard used to work for me regularly, and he's very capable. Len at Subaru 4U has been around for years, and you won't go wrong with Matt, & Olly Clark, but they are at the upper end.
I can only say that the other company mentioned, are right down in Plymouth, which based on my direct experience, is just about far enough away from Koenig, to be in his best interest. I will say no more !
Remember, Koenig isn't looking for modifications, bolt on cr*p, tuning, or remapping, just a good reliable service.
Subaru's left as they left the factory, and driven by normal, "grown up drivers", are very reliable
