According to the Evening Standard, the stunt took place at London Bridge station and Freddie did regret it.
The 22-year-old is quoted as saying:
I was that drunk - I’d had about 10 pints - the escalator was free and I thought, ‘why not?’
It was faster than I thought it would have been. But as I was sliding I couldn't stop myself and had no choice.
I did regret it. I was so drunk I did not feel a thing until I woke up yesterday and could not move.
He concluded by saying that he definitely wouldn't recommend it to anyone else.
In response, the London Underground has criticised the stunt and encouraged people to follow their safety guidelines.
A spokesman told the Standard:
Safety is our top priority and pranks like this are dangerous for not only those involved but also to other customers.
We have frequent PA announcements reminding customers to be careful when using escalators, and we also run safety campaigns throughout the year to encourage customers to take care whilst travelling on our network.