Has Boris Johnson only just discovered the ruinous cost of childcare in this country? He has, allegedly, been seeking a rich donor to pay for a nanny for his one-year-old son Wilfred. What’s surprising is not that the Prime Minister has apparently told friends he needs £300,000 a year to keep on top of his outgoings (life gets expensive when you have multiple dependents and properties), but that he has only now realised the cost of finding someone to look after his son.