Richard thanks for the detailed response. Some good points! I ended up at SMP early Feb with Andrew Kantor who has a lot of cyclist physio and bike fit experience.
While not having access to the full suite of components you mentioned, fit process was good, made a number of small changes which have been beneficial (cleats, seat, handlebar height). Amongst other items; reviewed and recommended changes in handlebar width, reviewed but didn’t change stem length.
Notwithstanding your points about access to components (which would be helpful as I have not got to changing the bars yet) I did find the fit process and outcomes to be good overall.
Being generally pro-physio for injuries, strains, recovery therapy I am probably biased toward the physio end of the scale and it was good to find find a cycling oriented one in Andrew.
Would recommend SMP to those that have a similar predisposition towards a physio for a bike fit.
John Kennedy sounds like a good alternative, clearly with lots of bike fit experience and access to the full shed – thanks for sharing!