For the last 2 MOTs (which I always find a bit 'interesting' with an Alpine) I've used Didcot Auto Centre, which is also the Top Gear Technology Centre
. They did really well at getting one of my rear brake callipers sorted out - sourced and fitted. They take the car seriously and are nearer and cheaper than my local Renault dealer, who are also pretty good for parts etc.
I haven't had to have DAC do anything too 'special', though, so I can't really make any comment on more complex stuff than the above - and we all know how invaluable experience like Clee's and Paul Sage's can be, not just in terms of cost but also in terms of actually doing the job properly.