Even better (for the party) they have created a 'foe' which can be blamed for Britain's ills with political impunity. If Scotland leaves the UK - which looks likely - they will be close to guaranteed a majority in parliament. Their recent election majority has given them the opportunity to ignore, weaken or ignore controls on the executive's behaviour.
For all his buffoonish behaviour and administrative incompetence Alex Johnson is a ruthless political operator.
I make no comment on the benefits or otherwise for the UK and its people which should be obvious by now.