"my knight on a shining bicycle"

London Mayor Boris Johnson, while biking across town, helped a young woman who was being attacked by some kids.

"I was texting on my phone so didn't notice the girls until they pushed me against the car, quite hard," Armstrong said. "At first it was quite funny, because they were only about 12. Then I saw that one of them had an iron bar in her hand. It was more than a metre long. It was as big as her.

"Then along came a cyclist. And I thought, 'Good, he's a big bloke,' and shouted, 'Can you help me please?'

"He stopped and turned around and I thought, 'Oh, my God, it's Boris Johnson.'

"He asked the girls what was going on, and at first they didn't move, so I said, 'That's the mayor of London!' and they ran off. They must have thought they were going to get in trouble. One dropped the bar, so Boris picked it up and cycled after them. He returned a few minutes later and walked me home, and we talked about 10:10."