I've been mightily impressed by Plaid Cymru and the Scottish Nationalist Party during this electoral cycle, and they're clearly working well together.
So I have a cunning plan. Instead of aiming for complete independence for Scotland and Wales, they should campaign for English independence, then form a federal Republic without England (Northern Ireland can finally join the Republic of Ireland). Result: paradise. And the two nations together would trump England when it came to deciding who got the United Nations Security Council seat. Then we'd see a much more mature world order.
There's no down side - other than for England, which would be stuck with a Tory majority for ever…