I think, looking through the guide, that this is the restriction that applied:
4.4.3 Applications made without the cooperation of the relevant proprietor – the need to show a sufficient interest
Where the applicant does not have the cooperation of the relevant proprietor, they may only apply for a restriction if they can satisfy us that they have a sufficient interest in the making of the entry.
R.93, LRR 2003 contains a list of standard situations where a class of person will be regarded as having a sufficient interest in the making of an entry. In most cases, the rule identifies which of the standard form restrictions will be appropriate to each situation covered.
The applicant must give details of the nature of their interest and how that interest arose. We will require evidence to show sufficient interest in support of an application.
This evidence must be a statement by the applicant in panel 12 of form RX1 or conveyancer’s certificate in panel 13. If the interest arises from a document (for example, a court order) the statement or certificate should refer to that document and a certified copy should be enclosed and listed in panel 5. We can ask for additional evidence if necessary (r.92(4), LRR 2003).
Hope that helps?
It was obtained without my consent and prevents me from selling the property without her agreement and was I think called a "cap" on the property but might be wrong there.
Sorry I can't help more.