DX Wombat
The problem is the out of touch with reality and history penpusher/jobsworth/spoilsport/money-grabber/whoever at the MOD.
Your supposition and wild allegations are completely wrong.
The MoD has changed its attitude towards visiting civilian light aircraft, but not for any of the reasons you claim.
Far from being "out of touch with reality", the MoD has very good reason to be all too well aware of the very real risk of claims being made against it in the event of an accident.
Even ill-founded claims are expensive, in both manpower and money, to defend.
Not surprisingly, and arguably not unreasonably, it has reduced its exposure to unnecessary risk.
I hope PP is a success. It's certainly a worthy cause.
FL