http://www.legislation.gov.uk/uksi/1987/1975/article/4/made

The Building Societies (Limited Credit Facilities) Order 1987

Building societies

King's Printer of Acts of Parliament

2016-04-28

BUILDING SOCIETIES

This Order empowers building societies with commercial assets of at least £100 million to operate accounts on which an individual can draw and to agree a limit of indebtedness of that individual to the society of up to £5,000. Any such indebtedness will count as a class 3 asset, and class 3 assets may not exceed more than 5 per cent of a society’s total commercial assets.