In recent years there was a cunning plan which involved getting two warring farmers (I believe) + the Dacorum Town Council around a table, with the instigator of the plan, to discuss re-opening Bovingdon with the express purpose of creating a business airport to serve north London and south Bucks/Herts.
I can't remember where the plan fell down but if there is anywhere that is still perhaps available for an environmentally friendly airfield getting up and running then Bovingdon would be the place. I am quite certain the burghers of Bovingdon village would far rather see an airfield/business park rather than a market and the constant stream of visitors to the fortified institution on the perimeter.