flathas the same meaning as in Part V of the Housing Act 1985;
ground levelmeans the highest level of ground contiguous with– (a) in the case of a structure where sub-paragraph (b) does not apply, the structure;
permitted developmentmeans development– (a) for which planning permission is not required;
relevant authoritymeans the Common Council of the City of London, a district council, a London borough council, the sub-treasurer of the Inner Temple and the under-treasurer of the Middle Temple.
rentchargehas the same meaning as in the Rentcharges Act 1977;
the Actmeans the Local Government Finance and Valuation Act 1991.