If you wanted a single example of how far all those who aspire to govern us after this election can lose any touch with reality, a good place to begin might be page 56 of the Conservative manifesto. Here, in a section on “Energy”, we are told how the Coalition Government has “unlocked £59 billion of investment” to produce “low carbon” electricity to meet our commitments under Ed Miliband’s Climate Change Act. All the projects listed are, of course, hugely subsidised, to produce power costing us all twice or three times as much as that from conventional power stations. But there at the end is a mention of “the Swansea tidal lagoon”.