I contact the 56-year-old rider Mark Wu.
He was very glad to encourage other "old" (just thought by themselves) riders in UK.
He said
"I have been seriously ill because lung disease laying on bed for about 5 years only skin and bone left, finally I decided to do something to save myself, so I start riding bike three years ago, I bought the trial bike one year ago, that picture was taken after 3 month of practice, now I changed to stock trial, I am Mark Wu, I am still not healthy, but I am alive and happy."