You put a spell on the dog," I said as we left the house. "Just a small one," said Nightingale. "So magic is real," I said. "Which makes you a...what?" "A wizard." "Like Harry Potter?" Nightingale sighed. "No," he said. "Not like Harry Potter." "In what way?" "I'm not a fictional character," said Nightingale.

Carved above the lintel were the words SCIENTIA POTESTAS EST. Science points east, I wondered? Science is portentous, yes? Science protests too much. Scientific potatoes rule. Had I stumbled on the lair of dangerous plant geneticists?

What do you think you're doing?

This I know for a fact: the reason African women have children is so that there's someone else to do the housework.

For a terrifying moment I thought he was going to hug me, but fortunately we both remembered we were English just in time. Still, it was a close call.

What's the biggest thing you've zapped with a fireball?' I asked. 'That would be a tiger,'said Nightingale. 'Well don't tell Greenpeace,' I said. 'They're an endagered species.' 'Not that sort of tiger,' said Nightingale. 'A Panzer-kampfwagen sechs Ausf E.' I stared at him. 'You knocked out a Tiger tank with a fireball?' 'Actually I knocked out two,' said Nightingale. 'I have to admit that the first one took three shots, one to disable the tracks, one through the driver's eye slot and one down the commander's hatch - brewed up rather nicely.

It's a sad fact of modern life that if you drive long enough, sooner or later you must leave London behind.