Suruti

And that plan was swiftly abandoned, and the surveillance team was withdrawn.

It's a public park.

Yeah.

And if you cordon it off, then the person's also not going to turn up and just stomp all over it because it's cordoned off.

With all of this in mind, along with Little Alex's description of the killer, and the interviews compiled from the hundreds of people on the Common that day, an artist's impression of the assailant was made, and broadcast on the British institution, Crimewatch.

So after the programme aired, 800 viewers called in saying that they recognised this man.

And a few of them, enough to make it notable, said that this man was Colin Stagg.

I mean, imagine that.

Imagine doing a Crimewatch appeal and then getting multiple people calling in and telling you that this is the name of the person.

Stagg had actually returned to the common that day that Rachel died.

He'd woken up feeling better and decided to take his dog out again.

When he got to the common, he was stopped by an officer, who explained why the park was closed.

Colin's dad told this officer that he'd been on the common that morning, but hadn't seen anything.

He gave the officer his name, and then went on his way.

But after the crime watch showing, police now wanted a word with him again.

Sir Colin was held for three days at Wimbledon Police Station and questioned at length.

During these interrogations, Colin was shown a crime scene photo of Rachel Nickell as she laid dead.

Remember this, it's very, very important.

This photo was taken from the back.

It did not show Rachel's face or, crucially, her hands.