Hunt arranged to meet the girl at Plumstead train station on September 14.

On arrival, he discovered the girl was fictitious and he had been talking to an adult.

It advised parents to encourage their children not to share their location publicly, but in private messaging apps with people they know.

A spokesman said: “Online technology is central to much of modern life, and the internet brings substantial benefits to people of all ages.

"However, we are alive to the threat of those with a sexual interest in children seeking to exploit various tools for their own ends.

"These people do attempt to make contact with children over the internet, through social networks, chatrooms and games.

The court heard how Hunt engaged in online conversations with a girl in September last year.

It’s more varied than a pub, cheaper than a night out and less forced than a singles event.

"Information and guidance for children and young people from 5 to 18 on staying safe online and in the physical world, as well as information for parents and teachers, is available on our dedicated website, "Anyone who is concerned that someone is in immediate danger should call 999.

The first rule of the London Underground is: You do not talk aboard the London Underground.

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