Andy Burnham has promised Britain's biggest council housebuilding programme since 1945. That is the headline everyone has taken from his first week in office, and it is worth pausing on the word "council," because it points to a shift in who commissions housing in this country, not just how much of it gets built. For most of the last two decades, private housebuilders have set the pace. They chose the sites, ran the programmes, and instructed the consultants. Councils and reg