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Yes, if the intention was that this piece of land was also being sold at that time and money was paid for it, a court could easily order you to sign it over or a court could make an order that the buyer be registered as the owner of the land. This is under S. 14 of the Trusts of Land and Appointment of Trustees Act 1996 as the law would treat you as holding the title on trust for the buyer.
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I would advise you to sign the necessary documents before any proceedings are filed.
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