where is the other 'Kingdom' for the English crown to be United with?
We've already had the Welsh kings mentioned, but don't forget the Kings of Wessex, Kings of Northumbria and the Kings of "Cornwall", amongst others - surely that is enough precedent for the retention of United Kingdom. Of course we should not forget that there were also the Kings of Ireland so more than enough kingdoms to retain the United Kingdom monicker (although I really did like the thought of the Untied Kingdom
)
As for Scotland surely that just remains the Kingdom (or Queendom) of Scotland - Alex plans to retain HMQ as HoS.