I suspect SMP are quite good. But the problem with physiotherapists doing bike fits, IMHO, is what can they really change? I had one done once, and the only things they really looked at, or can change, is seat height, seat fwd/back (within a limited range), and cleat position. They didn’t consider the handle bar position at all. Why? Because the don’t have a stack of stems in their shop, that allow them to change handle bar position. So they pretend it’s fine. And most commercial bikes don’t allow you to raise the existing stem, because they have no spacers above it (fashion beats function).
On the flip side, bike shops doing bike fits don’t have the medical knowledge of a physiotherapist.
I’m not sure someone has combined the best of both worlds, but I recall some mention somewhere of physiotherapist connected with or working in a bike shop in Malvern.
I guess it’s pretty obvious where I go for bike fit. John Kennedy has a bucket load of seat poles, seats, stems and handle bars. In fact, he doesn’t really stock other parts. And selects and fits what works best while you cycle against resistance on a trainer. It’s works for me, and the Physio really didn’t suggest any change, but its not always a universal answer.