See London in a new light, with the streets glowing in neon.

A London full of people walking in the same direction, beating cancer one step at a time.

And yes, a London where people actually say hello as they walk past.

The 20th of September is Cancer Research UK's Shine Nightwalk, and it's when London really sparkles.

Step up and sign up today at Shinewalk.org. Choose from the 10K,

half marathon or full marathon walk and get 30% off your entry. Together we are beating cancer. Teas

and Cs apply. It's even worse than the bus than it is in the bar

with everything is drunk and shouting and screaming

and the wind is steamy from the rain

and the hot dog sellers are dragging out of the machines

and smoke full there.

It's a strange time of the night

and Oxford Street at 2 o'clock in the morning, you know.

Welcome back to episode three of Polonium and the piano player from Sky News Storycast.

At the end of episode two, we left Derek Conlon as he was making his way home on the night of the poisoning.

Eight hours after he unknowingly drank from the same radioactive cup as ex-Russian agent Alexander Litvinenko.

But we're now going to fast forward two and a half weeks.

It's the stuff of a Cold War thriller.

To the evening of November the 19th, 2006.

Derek is at home.

He's not at work tonight and is half watching the news.

A few days ago when he got the bus to the Millennium Hotel,

...