Policeman to undertake incredible fundraiser after being left shocked by unexpected twist in suicide call out

But when the ex-military - turned armed police officer - arrived at the scene, he realised it wasn't a stranger in crisis, but his brother - a serving soldier in the UK army - moments away from attempting to take his own life.

Mr Caswell managed to walk away from the scene with his brother alive.

However, he admitted the emotions "pushed him further over the edge".

He told GB News: "I had to step back and then one of my colleagues managed to grab him and pull him over the right side."

Following the incident, the police officer from Warwickshire believes his brother "was not dealt with properly" regarding his mental health and continued serving in the army.

When Mr Caswell's brother returned from Afghanistan, he was suffering with complex PTSD and tried to take his own life again.

In a shocking twist, Mr Caswell attended the scene of his brother's second suicide attempt as well, where he had driven his car into a brick wall at high speed.

It was those moments which were a "catalyst" for Mr Caswell to think "this isn't just a one off".

"I was seeing more instances with soldiers, airmen, navy personnel who were having a hard time in civilian streets and not really being dealt with properly," he added.

"When veterans come into our contacts with the police, it's one of two ways, we come across them in the streets where we converse with them, whether they're homeless or whatever or through... a phone call coming in to say there's been a violent incident or whatever."

Mr Caswell said his brother had been sectioned before "coming out the other side" where he works for the NHS as a peer support worker.

He described his brother as a "shining example that we can catch these individuals and we can work with them".

Mr Caswell then embarked on an extraordinary journey of putting himself through severely painful challenges to raise awareness for veterans' and police mental health.

Despite having already completed a number of challenges, including climbing up a mountain with 50 kilograms on his back and then running 157 kilometres, Mr Caswell is preparing his next challenge titled 'Run with Purpose'.

It involves running 375 miles all within five days, starting and finishing at various Army Reserve Centres across the country, including Derby on the first day and Portsmouth on the final day.

That's a staggering five ultra marathons alongside cycling over the course of the brutal journey.

Mr Caswell - along with his good friend and armed forced officer Stewart Henderson - believes that some police officers "don't have the ability" to know what to say or how to identify a veteran in need.

The 52-year-old said: "How to take their hand and take them in the right direction.

"That's part of my journey... in these last 14 years, these mad charity events that I do, I do a mad event every year.

"Every year they get worse and I nearly end up killing myself."

But for Mr Caswell it's worth it, telling the People's Channel: "If it raises money for these charities... if it raises the profile of some of the work that some of these charities do, then going through that pain is worth every little bit of it".

He added: "It's not highlighted enough, the amount of veterans that either commit suicide or end up being in a bad, bad place."

Mr Caswell and Mr Henderson became friends four years ago and they share a common goal of helping veterans and police.

Mr Caswell revealed: "I do it because after the Borough Market Terror Attack... I needed a lot of support, and I went to the MET and nobody helped me.

"I was in all sorts... in the end I got help, but in the end I promised myself that others, including police officers and veterans, because I've had friends like Scott has who killed themselves.

"Because support's been withdrawn."

Mr Henderson said out of the more than a thousand charities designated with helping veterans, "there's probably less than 100 that do any good".

What Mr Henderson and Mr Caswell are continuing to fight for is not just about support, but about education.

Mr Henderson added: "The training for police isn't just about understanding veterans and showing empathy. It's also about giving officers the tools to identify the right pathways of support.

"This is about prevention: making sure officers don't themselves become victims, not because of wellbeing or mental health conditions being ignored."

Mr Caswell's challenge will start on September 22 and ends in Portsmouth on September 26. To support, click HERE.

For emotional support, you can call the Samaritans 24-hour helpline on 116 123, email jo@samaritans.org, visit a Samaritans branch in person or go to the Samaritans website.