Why didn’t David Lammy give Corbyn a helping hand at PMQs?

The royal nativity opened proceedings at PMQs. Mrs May sounded thrilled about the newborn nipper but the Labour leader could barely conceal his ill-temper. Mr Corbyn slouched at the despatch box and forced a muttered tribute to ‘their baby’ out of the side of his mouth. He sounded like a man who’s just twisted his knee laying flowers on his mother-in-law’s grave.

But why the aversion to Supermum Kate’s non-stop sproggery? A wise Marxist ought to welcome a population explosion at the palace.