If I remember correctly Barry Walker had a nice blown PA for sale about a year or two ago which had an interesting history, having been owned for many years by a pilot, I think. Together with the car were many items of historic interest - I think also a book written by itīs long-time owner. Perhaps it is worthwhile following this path.
And perhaps Ian Grace of "prewarprescott-fame" can help you - he seems to have good contacts with the RAF as somehow he manages to get an historic aircraft display to the hill.