Having been born in England, educated in Scotland, employed by the BRITISH Army and having spent a decent chunk of time living in Norn Iron, I can add the following pearls of wisdom:
1. Scotland is a pretty decent place.
2. The North East of England (minus wearyside) is also pretty decent.
3. The rest of England and Wales is alright with the exceptions of London and Merseyside (which are full of c***s) and Birmingham (which is a shithole).
4. Norn Iron is about 200 years behind everyone else due to some Sectarian pricks who have ruined the place.
Therefore, if the split happened, i'd rather it was at Cleveland in order to say with the decent half of the country. But it wouldn't work because the Scottish economy would instantly fold.
I'd be all for giving Norn Iron away though, nothing to offer the UK whatsoever.