I've said this for a while now. As long as a sizeable proportion of the English electorate think that any other constituent part of the union is getting subsidised, sponging, etc then the union is dead. And since that genie is not going back in the bottle the long term future of the United Kingdom is in the hands of Brexit backing middle England. The same people would love to shoot themselves in the other foot by telling us to F-off.
The UK is therefore done for.