I have a feeling they are the legal agreements that used to be used. As far as I understand they are now issued as section 106 agreements. These relate to planning obligations such as financial contributions in relation to a permission/development.
Section 52 is just a coverall for a planning agreement. In other words something was agreed to be done or carried out when a planning permission was given - maybe for you original house. If it's holding things up it implies the agreement was never discharged. It might have been to pay a sum of money towards local services. Or it might have been an agreement to do something more specific. The question is; what was the agreement?
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