I owned a bungalow with two acres of land. In 2009 I sold the land and made an agreement that if it was developed for housing I would receive 50 per cent of the net profit. Two years later I sold the bungalow. This year the builder paid me to end our agreement, but the new owners of the bungalow say there’s a covenant in their title deeds which says the builder must pay them to end the agreement, not me.
Either you made an agreement with the builder when you sold him the land, or you altered your title deeds to benefit the owners of the bungalow: it’s unlikely you will have done both! Without seeing the documents it’s difficult to say who should receive the builder’s money, but since he’s already paid you I suggest you let the builder worry about it.