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A Londoner who used to contemplate suicide on his morning commute is now running the length of every Tube line to raise money for a mental health charity.

Daniel Sherry, 29, quit his sports PR job in April 2018 and set about completing “30 challenges before 30”, including running his first marathon and cycling from London to Paris.

His latest exploit is seeing him traverse all 11 lines of the capital’s 249 mile-long underground network above ground, on foot — the equivalent of almost ten marathons in 11 days.

The former Highgate School student, who grew up in Crouch End, said he was inspired to raise money for the charity Mind after suffering a major breakdown aged 25.

He told the Standard: "There was a period when I first suffered with suicidal thoughts, and I would get the train to work every day and my first thought was to jump in front of the train.

“I have got a great counsellor now but most importantly I have got friends and family around me. I now have the most beautiful loving girlfriend that would do anything for me, and I'm in a much better place all round.

“All I knew was that I wanted to give back to people and I don't want people to go through what I did. So I thought I would try and push myself to the absolute limit for the year."

Mr Sherry, who now lives in Berkshire with his partner Rebekah Donaldson, spoke to the Standard from Euston Road on the Circle Line leg of the challenge on Monday.

He plans to finish the unusual feat on Saturday by tackling the 36 mile-long Northern Line — from Edgware via Charing Cross to Morden, back via Bank to High Barnet.

“It’s so physically and mentally taxing. The first day alone was my first ever ultra marathon,” he said. “[I wanted to do it] because it was unachievable in my mind. The thing that inspires me the most is when people say can’t do something, and you can say I did it.

“[And] it's a great way to get to know London. There are definitely places, like Upminster, that I had would never have gone in my life before that now I have been to.”

The challenge has given Mr Sherry a new-found love of London’s iconic transport network, he said.

He said: “When I used to get on the tube to work, it was the most horrible feeling. But now I actually appreciate the tube — even when I’m a sardine stuck in it, my god it is such a great invention.

“I probably appreciate the tube now more than anyone else in London."

And his new found method of transport is unlikely to last for ever. “Its about getting out of comfort zone,” Mr Sherry said. “I actually hate running.”

To donate visit justgiving.com/danielsherry. Follow the challenge on his Instagram at @danielesherry.