of LGBT veterans who were sacked or forced out of the military for being gay.
It was one of his partner's friends who invited the pair to take part in the World Naked Bike Ride to commemorate the overcoming of the health scare."I thought, not a chance," Mr Lewis recalls of his initial reaction.
"Then I sat on it and thought, you know what, if I could go through what I went through with my brain tumour, then I can do anything."I figured as well, because of the impact that all this has had on my mental health, I'd like to sort of strip away the stigma."He said there were lingering elements of the railway industry being "male-oriented", which made it important to encourage people to talk about their mental health.
"I thought by doing this bold move, it'll gain people's interest, and it has really," he said."It's raised a lot of conversations, certainly with colleagues, talking about their own mental health stories, so in my eyes it's really worked."
The route of the World Naked Bike Ride will see the pair cycle through some of London's busiest areas.
Cyclists from across the world will depart at 14:50 BST on 14 June from Regents Park.Tuesday's search will be the first to take place in two years. The last search took place near a remote dam, a 40-minute-drive from where Madeleine was last seen.
Local media reports the new search will focus on the area between her family's holiday resort and the house where the prime suspect in the German investigation, Christian Brückner, used to live.The 48-year-old was named by German authorities in 2020, while serving a sentence in Germany for raping a 72-year-old American tourist in Portugal in 2005.
He has never been charged in the McCann case and denies involvement.The number of people injured when a car drove into a crowd during Liverpool FC's Premier League title parade has now increased to 109, police have confirmed.