My personal opinion is that Norwich looks around and sees other people doing it and says 'we'd better do that too.....'
Major commerical operators have departed Norwich in the last few years and as a Eurohub it has tremendous potential which has never been fulfilled. It could easily be another Amsterdam Schipol if it wanted but it just prefers to continue in its normal (mismanaged) way.
Anyway with the appaling local road system, lack of motorways, un-connected railway system (the nearest station is 10 miles away), and wierd local attitudes to development and progress this Class D is never going to be required without a major sea-change.....................
Arc