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
Poll: Should the UK’s railways be renationalised?
The term innovation is bandied about in relation to rail almost as a mantra. Everything has to be innovative. There is precious little evidence of...