Thanks for your Question.
You should ask your solicitor to check your lease in the first instance to see if what the leaseholder is saying is correct.
If it is then the Lease can only be varied with the consent of each of the freeholders AND the leaseholder themselves. A deed of variation would have to be executed and usually the leaseholder would require a fee to be paid because they would argue that the value of their property is diminished by shared use.
If the leaseholder is not amenable to a variation or otherwise an informal confirmation that the shared use shall continue then there is not a great deal you can do I'm afraid because in order to otherwise claim a right of shared access you would have to have been exercising the right informally for a period of 20 years in order to claim it by prescription.
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