chevvron,
I'm fairly familiar with Netherthorpe and at least North Denes is flat (Netherthorpe's 'arrestor' system, aka the hedge, has been put to good use several times).
I guess anyone on here would hope that North Denes will remain an airfield but that'll be for the new owner and the council to decide.
I think it's up for about £2M so it would take a shrewd investor to make it pay, some good facilities there though for aviation or other businesses (but then there's lots of unoccupied (and new) industrial space on Great Yarmouth's industrial estates).
Would there be enough custom for a flying school?
Back to Air Cadet gliding and at the current rate of recovery it'll be at least another two years before all 60 Vikings are available, there's time for a couple of defence reviews along the way.