Except for households blessed with rather generous incomes, most mothers these days have to work to keep a family decently fed and housed. Some kind of subsidised childcare is therefore an unfortunate necessity. The government recognises this, and has just introduced a new scheme. When fully up and running, it will give parents working full-time who earn less than £100,000 a free 570 hours a year of child-minding or early education for each child between nine months and four years.