Links and acknowledgments

Hydropower

British Hydropower Association
A Guide to UK Mini Hydro Developments
http://www.british-hydro.org/mini-hydro/index.html
MannPower hydro electric systems
http://www.mannpower-hydro.co.uk/index.php

Heatpumps

ISO Energy - Heat pumps and renewable energy systems http://www.isoenergy.co.uk/

History

Thanks to Frensham & Dockenfield History Group

The Watermills of Surrey, Derek Stidder

Environment

A.G.A Group bio engineering case studies for river erosion control
http://www.agagroup.co.uk/bioengineering/bioeng-case-studies