Lone_Ranger,
The only decent thing about the place now is the restaurant.
Any hint of real flying atmosphere has been forever destined to purgatory since MBB took the helm and cherished ambitions of turning it into London North airport.
The above inflation rises in commercial rental (coupled with getting 'more important' customers settled in) has forced out some decent companies/schools over the past decade.
Sywell still hosts some decent shows but I feel an air of emptiness every time I visit the place these days. It used to be an industrial estate that felt like an airfield and ironically it now feels the polar opposite.
Just my opinion...