Clearly enjoying his interview at the recent FT Weekend Festival, the former UK Prime Minister, John Major, started by comfortably batting back the gentle early questions. But his mood soon darkened as the twisting bounce of Brexit, the Union and the Tory Party had to be faced. Before returning to the Test match at the Oval, he delivered a disturbing assessment of the dangers ahead. We should ponder them. Fundamentally, he warned that the dangerous cuckoo of English nationalism has trampled into the nest of the Tory Party. Fuelling and now fuelled by Brexit, he said English nationalism, via an…