I don't think doncaster is needed as there are other airports very close by on this tiny island. Too much division of a region just helps competing regions as certain routes struggle to get established. I think MAN airport is quite happy that doncaster divides the Yorkshire region. Controversial but true. Prices of flights would be realistic then and not loss makers and hence airports would make a regulated profit and not keep going out of business. We are a tiny island and there are too many airports. Rationalization would only help the UK aviation industry.