Several letters on renewable energy have made the point that wind is not reliable, but then include tidal energy schemes in the same breath.
We have 24-hour tidal energy available around the British coastline.
A large number of (small, simple) machines in suitable positions could produce continuous power several times greater than that intermittently produced by the Severn barrage.
Richard Buchanan
London
Report highlights significant impact of manufacturing on UK economy
Note to Evil Villain/Dave 2020. Thatcher was PM for _11_ years, from 1979 to 1990 so no one under the age of 34 was even born when she left office....