Yes - we paid £6000 to the Council for a ransom strip...20 years ago
Basically we had planning permission to build a house in our garden, but could not use our entrance for this extra house. We had to have a separate entrance . Fair enough. But, it meant crossing over a 10foot square of ‘common land’ /ransom strip to get to the road.
Initially they wanted £20000. After much negotiation through our skilful Solicitor, we brought the price down to £6000.
My advice......don’t buy anything with a ‘ransom strip’. Or, get a good Solicitor, one who does not have much connection with the local Councillors. There will be divided loyalties.
Good luck to your son !