So the UK government agree with my assessment on the Swansea

[Suff]

The power to be converted to energy is there, all it needs is the will to use it.

And the foresight to spend the money on it.

[TheOstrich]

The Thomson double-vortex turbine used in Gayle Mill, despite being inefficient by today's standards, produced 7.5kW. A modest modern installation, where efficiency is up to 90% could easily treble the Thomson with the same head and flow. A "run-of-river" system with multiple power plants could easily deliver 500kW to 1MW without the need to dam or change the flow of water.

There's a double screw turbine already in operation at Totnes Weir, Devon, which can generate 320kW per Wiki.

Pics from the manufacturing company's website here:
https://www.castlefordengineering.co.uk/current-projects/