Yep, I agree Stansted and Luton [possibly] deserve the "London" title. Lydd and Manston do not. Norwich [and Cambridge] have a significant pax input and I think that they would describe themselves as "living in the[ B]South East of England[/B] I stand to be corrected of course
I'm not sure many residents of Norwich would consider that they live in south east England. I suspect most believe they live in East Anglia.
According to my Auto Route, Norwich is 113 miles from London, whereas Southampton (83 miles) and Bournemouth (109 miles) are closer, and these last two are probably nearer to 'south east England' than is Norwich.
But it is very subjective anyway, because some residents of Devon and Cornwall don't believe that Bristol is in south west England but is really an outer suburb of London (121 miles away).
All distances I have quoted are from the city centres to central London.