The Housing (Right to Buy) (Mortgage Costs) Order 1992
Where a tenant exercises the right to a mortgage or the right to further advances in connection with his exercise of the right to buy under Part V of the Housing Act 1985 (“the Act”), the landlord (or, if the landlord is a housing association, the Housing Corporation (in England) or Housing for Wales (in Wales)) may charge to him the costs incurred in connection with his exercise of the right to a mortgage or to further advances, to the extent that they do not exceed such amount as the Secretary of State may specify by Order. Article 2 specifies £100 as the maximum amount which may be charged.