Forget the unfairness of cancer drugs free on the NHS for Scotland being unavailable in England, or the fact that Scottish students go free while English students pay for university.
Now we have river wars! Later this year the River Tweed, which marks the border between England and Scotland, will come under Scottish law. An angler who fishes from the English side will be breaking the law because Scottish laws on the catching of salmon are stricter. English MPs can do nothing about this. Alan Beith, MP for Berwick, says: "The Scottish Parliament can change the law without England having any say at all."
That is rampantly unfair, but it does conjure up a lovely picture of kilted Scots river custodians yelling impotently from the north bank while impudent wee Sassenachs fish on the south, out of reach. Unless they also have the right to send in snatch squads.
I wouldn't put it past them.