Totally agree with A10Boy re T & L in Elstow Beds. Good on all engineering issues, from vintage and classic to Santa Pod dragsters, also have state of the art dynamic crank balancing kit. I've had cranks done, rods rectified etc and am currently using them for resleeving of various barrels. Great to deal with.
You asked about dave lindsley for mags A10Boy - got one fully reconditioned for a friend earlier this year by him. Took about 10 weeks turn-round, but the result was as new in every detail. But you pay for what you get. I'd recommend SRM for mags too, having had a K2FC redone by them in 2008 - bit quicker maybe, but similar sort of prices. They also do exchange armatures off the shelf, which most people don't.
If we're recommending people here, I'd also put in a word for www,hitchcocksmotorcycles.com the RE people for AMAL stuff - excellent service and web site.