So farewell, Hunterston B, the nuclear power plant on the Firth of Clyde that shut last week after 46 years’ service. It will be followed this summer by Hinkley Point B in Somerset and in 2024 by Hartlepool and Heysham, leaving the UK with just four nuclear stations boasting five gigawatts of generating capacity between them — when they’re not suffering extended ‘outages’ for maintenance and repair.