"So is it at all conceivable that actually once the Police take it over they will decide that actually, this is too expensive and start letting GA back in?"
Let's analyse that:
1) Hampshire Constabulary took over the running of the (fully functional) airfield from the Royal Navy in 1996.
2) Hamsphire Police do not seem at all uncomfortable with the cost to them of running the airfield - what they have said thay cannot fund is an ADDITIONAL £300k on (unspecified) upgrades to airfield infrastructure which would be required to resolve the (unspecified) Health and Safety concern if GA and Gliders are to be allowed to continue their mixed operations.
3) The notion that the Police/MCA *could* invite General Aviation OR Gliding back to Lee at some future date ... ....well, what is that all about, really... ...be good, go away, and who knows one day *some* of you *might* get an nice invitation from the Police/MCA to access a government aerodrome that the DfT own? Is it credible for a Consultants report to end with a conclusion like that?