approved mortgage

413(in COLL and CIS) a mortgage:

1. (a) which the trustee reasonably believes can be discharged on demand or within 28 days by repayment of all the money secured by the mortgage (including, where appropriate, any additional sum provided for under the mortgage); and
1. (b) on which there is not secured any property, whether immediately or contingently, other than the approved immovable in question.