Colin Wilson wrote:
Has anyone suggested "Leasing" the land instead and having an income from it
with the right to reverse the situation should your parents wish to sell ?

Good idea - ISTR a right of way might be granted if the neighbour was
given a full 12 months unrestricted access, so a lease offering 364
days was the way to go, and the access being "closed" to them for the
next day.
As regards the value the potential buyers should get an independent
valuer then they can make an offer. Or they can just make an offer which
your parents can accept of decide it is not worth the hassle, plus of
course the buyer will pay all costs involved.

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