More news from Powys. Their decision to turn off unnecessary street lighting, thus saving a fortune, is being followed by other councils in Wales including Torfaen, Blaenau Gwent, Pembrokeshire, Ceredigion and Carmarthenshire.

Powys are being flexible – sometimes turning lights back on – but overall have found the experiment a success. It's not just about saving money, of course. I've written for The Guardian's Comment is Free website on the subject.