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What is your question please? Who is the freeholder? How long is the lease?
No, I agree with your solicitor, an underlease is the same as subletting, so your landlord would be the current seller, not the freeholder. Normally, you would be assigned a lease.
In your case, your interest would be lesser than the freeholder and your lessor.
You should insist on a new lease being granted by the freeholder so that your relationship is only with the freeholder.
May I help further?
Please accept to continue.