No misunderstanding from me Ray - we're just openly sharing our experiences of where we've had good service from good suppliers, which is what the forum should be about. I've never used Guy for this work, though I obviously know him well and respect him, whereas I'd wholeheartedly recommend Mackies from experience (like Jim).
I suspect both would do a good job in this instance - I personally went for Mackies based on the recommendation here, a less than perfect experience with Chester Transmissions beforehand, and - probably most importantly - the 3 year 100k warranty on the gearbox rebuild offered by them