I envy you, Len.
As it happens, a couple of hours ago I picked up (from a second-hand book shop) Volumes I-III of "Engineering Workshop Practice" by Judge & Horner (1948). "Chapman" is another one I used to have (and may well pick up again if I see it - or rather, them [three volumes]).
Meanwhile, I have come across the odd "fully equipped" medical engineering department in the UK ... Gloucestershire Royal Hospital comes to mind.
But "back in the day", although British Military Hospitals (anyone remember those?) usually had a resident technician or two (or six), anything requiring the sort of resources you mention would have been carried out at the supporting Command Workshop.
Yet again, for the life of me, I cannot understand why the NHS does not have a similar system in place; 1st, 2nd, 3rd line etc.