A man who had 29 life-saving brain operations is jogging the length of the UK to raise money for the Liverpool hospital that saved him.
Simon Lannon, 29, wants to raise £60,000 for The Walton Centre for Neurology and Neurosurgery NHS Trust.
He has been cared for there since being diagnosed with hydrocephalus, known as water on the brain.
The businessman plans to jog from Land's End, Cornwall, to John O'Groats, Highland, in April.
Mr Lannon, who is a managing director of an architectural design and development company, said: "The Walton Centre is the only place I have ever had treatment.
"They have saved my life a couple of times.
'Mental toughness'
"I averaged being there about six months out of every year from the age of six to about 20.
"I like to do things that haven't been done. Someone who has had brain surgery as many times as me has not done the jog from Land's End to John O'Groats.
"I will be averaging around 10 miles a day."
The challenge follows a triathlon he completed in May last year, which raised more than £4,000 towards the £60,000 target.
He added: "There are two things that give me an advantage.
"My body is very good at recovering quickly when I exercise due to all the operations I have had and because of all the surgery, my brain has this fantastic mechanism where I can block out pain so that I can run the distances."
During his operations, Mr Lannon had a permanent titanium valve fitted in his head, and has several shunts - a type of catheter - surgically implanted into the ventricles, the main cavities in the brain.
The valve system regulates the pressure in his head and opens once it reaches a certain point, allowing the fluid on his brain to drain away.
Richard Lynch, head of marketing and communications at The Walton Centre for Neurology and Neurosurgery NHS Trust, described Mr Lannon as a "legend".
He said: "His level of physical fitness and mental toughness is beyond what most people will ever manage.
"When you consider what he's achieved after all he's been though, it really is quite incredible."
