A quick update: Old Git, PP organisers are aware of the problems with the runway but have been assured by the owners that it is swept regularly and will be suitable for landing on the day. They will also fly in and look again for themselves. Arrangements can't now be changed so will have to stand.
Genghis - the person organising the allocations is away at the moment but expected back this weekend so you, and anyone else who may be wondering what is happening, should hear something soon.
Landing at Scampton is, unfortunately, not an option - NOT because the Station Commander doesn't want to have PP there, quite the opposite, like other SOs his hands are tied and he isn't allowed to make any decision about his own airfield. The problem is the out of touch with reality and history penpusher/jobsworth/spoilsport/money-grabber/whoever at the MOD. Landing at a RAF field in an emergency is fine, but 100+ civilian light aircraft in one go is likely to cause a collective coronary at the MOD.