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Check out Dulas engineering. They're an offshoot from the Centre for Alternative Technology in Machynlleth. I almost did a training course in micro-hydro with them - was accepted, but funding did not come through in time for me to take up the course.
https://www.dulas.org.uk
Also, check out:
https://www.powerfromthelandscape.co.uk/links/micro-hydro-resourcesguides
Cheers, Gavin