To meet the RESA requirements the runway thresholds would have to be displaced to 1,167m (code 2) to provide the 90m areas that were not present before? I also think that moving the car park was mentioned to meet the necessary safety distance from the terminal building.
I don't see how a 19 seat aircraft to STN/MAN would work (VIABLE's plan), aircraft would be limited due to the runway length anyway - so not many contenders if the airport did reopen (D328, ATR42, J41)? Viable even list the Twin Otter as a potential aircraft!
Another major income for the airport was the Royal Navy and FOST which apparently generates £600,000 per year.
The report also mentions over £9 million to reopen the airport up to standards.