[MargaretR]

Found this in an old pdf leaflet issued by HBC before the stock transfer -
The Stock Condition report showed that 664 homes failed the Decent Homes
criterion (18.82% of the stock), and a further 2,544 properties have the potential
to fail if no investment is made. To meet and retain the government’s Decent Homes
Standard the report identified the need to spend £154m on the Council housing stock over the next 30 years. £45.2m of this needs to be
spent by March 2010 to meet the Office of the Deputy Prime Minister’s deadline of 2010. This expenditure includes capital works consisting
of catch up repairs, future major works and improvements to the stock as well as some estate and environmental improvement works.

664 homes = 18.82% of stock

someone else do the maths please my mind is seizing up