Interested party observation only; From a Lancastrian living in London having businesses in Kent and South Manchester knowing quite a few major retailers Sauchiehall Street shops and cafes are among the most profitable tranditional High Street premises outside London and the South East however I digress.
Edinburgh, York, Chester, Stratford on Avon and Oxford/ Cambridge are the primary points for inward tourism period.
Edinburgh Airport is ideally positioned to capitalise (no pun) on such traffic particularly from China and the US I suppose.
The fact that Hainan are operating aysimetric services probably supports the consensus that tourists either arrive or depart part of their itineraries elsewhere imho.