A train enthusiast is celebrating Friday's (August 19) launch of the Night Tube by staying on the underground for 24 hours - starting in Hammersmith .
Dave Lovering began his journey at 4.30am and is aiming to travel continuously travel on the Tube without exiting the gates.
The dad-of-four, who says he's "53 and should know better", has been updating on his journey on Twitter ever since in a bid to raise money for mental health charity Samaritans.
Mr Lovering said: "I think there will be boisterous people about – but I don't think it'll be any different to any city centre or a night bus.
I have always been a train enthusiast and thought I'd love to come up to London for the start of the Night Tube after living here in my 20s.
"I know people do tube challenges – so when I saw the Night Tube is starting I wondered if anyone had done that.
"I couldnt find anyone, so I thought why not?
"For my 24 hours of madness I am attempting to raise £200 for The Samaritans."
If you want to make the most of the Night Tube in a less outrageous way, check out our list of things to do in London at night time
Fuelled by crisps and sandwiches
He has been posting selfies at each stop alongside the hashtag #24hoursonthetube and has met a Met police officer and tube workers along the way.
Mr Lovering, from Devon, has so far travelled on the Jubilee and Metropolitan Lines but will later head to the Victoria and Central Lines - where the night tube will launch.
He added: "My diet of sandwiches and crisps for the day won't be great but I had a good supply of veg before I came up in preparation.
"My son Ben is meeting me a Stratford to give me some supplies and I'm charging my phone using a solar charger.
"I think it's a wonderful charity and with this being to do with the Tube line I think it is the right one to do, as many people have been desperate to make a difference to their lives with the tubes."
He added he will end his mammoth tube journey at Waterloo at around 7am tomorrow and then "just sleep on the train the whole way back Exeter."
His "golden rule" is he's not allowed to leave the ticket area at any station, meaning he will get water and food from kiosks and only use toilets within the stations.
To donate to Dave's tube adventure visit his page on justgiving.com .