A second referendum may be the price David Cameron pays for playing England against Scotland during his election campaign

As ye sow, so shall ye reap. In the case of David Cameron and Scotland, the Prime Minister has spent the past few months sowing the seeds of discord between England and Scotland; he is now going to reap a whirlwind of revivified Scottish nationalism. On his visit to Edinburgh, Mr Cameron will glimpse the first straws in the wind. Nicola Sturgeon, as the whole UK has come to see in recent weeks, is more than a match for the Prime Minister and, while the proceedings will be no doubt polite, Mr Cameron will be left in no doubt as to the scale and strength of Scotland’s ambitions.