I have, after my LPA's five-month procrastination, regained the PDR on a small piece of land behind my house. I should like to thank all those who posed questions and/or answered them here - all most enlightening.
The land is a long strip behind several houses, sections of which were conveyed to individual houses, and although at that time, its description was changed from "amenity land" to "garden land", PDR was removed. Thus, each "garden" could not be fenced off for privacy and security.
I have now been asked by a neighbour whether his and the other affected properties will automatically regain PDR without application and I wonder if anyone here would have the answer to that question.
I know the obvious course of action would be to ask the LPA but I thought that somebody here might be able to provide the answer in less than five months!