"As I understand it, the best way to get pregnant is not to want to get pregnant." Her needles swiftly add length to the tiny sock. "I'm afraid you're doomed for disappointment. Better to work on your own."

She smiles wistfully. "Or wait fifteen years or so. Cadogan and I made a pact to fill the world with ginger if neither of us have spawned by the time I'm forty. Apparently we're a dying breed."