While the idea of Citywing is interesting, I just can't see Oxford or Southampton working. Southampton to Waterloo takes a minimum of 1h15. A taxi from Kidlington to Oxford followed by a train to Paddington also takes a minimum of 1h15. Assume 1h00 flight in a prop, 10 mins from aircraft seat to leaving the airport, 10 mins at train station for ticket / waiting for a train, 30 mins at Newquay for checkin, and 30 mins from office to Newquay airport, and you are already at 3h35. And that's just to Paddington / Waterloo rather than the place in London you want to reach.
A train from St Austell to Paddington is approx every hour, takes 4h30 and has the advantage of being undisturbed time allowing work to be done. The result is that while for Newquay residents a flight to OXF or SOU makes sense, you have shrunk the catchment area quite a bit, making it harder to get enough bums on seats.
If an air route to London is to work, I think it'll have to be Stanstead or maybe Luton - Southampton and Oxford are just too far from London to really be competitive without some sort of taxpayer subsidy.
Last edited by davidjohnson6; 29th Oct 2013 at 15:35.