As David Cameron’s Cabinet colleagues fan out across the media to tell us how catastrophic it would be for Britain to leave the EU, one minister is in a class of her own. It may not be surprising that Amber Rudd, as the sister of Roland Rudd – one of the leading lobbyists for Britain to stay in the EU – is a keen Europhile. But when our Energy and Climate Change Secretary claims, in a Daily Telegraph interview, that it would be bad for Britain’s energy security and costs to be excluded from our leading role in the EU’s “energy market”, we have to ask what game she is playing.