Beginning of 5 page memo in 1985, by Oliver Letwin and Hartley Booth, from Mrs Thatcher’s Policy Unit

"Lower-class, unemployed white people lived for years in appalling slums without a breakdown of public order on anything like the present scale; in the midst of the depression, people in Brixton went out, leaving their grocery money in a bag at the front door, and expecting to see groceries there when they got back."

When this document was made public in 2015 Oliver Letwin said parts of it were "badly worded and wrong". I am not sure whether he explained which parts.