John Merlini says  "Our 1947 Holiday Camp photo shows Don Brown, Alan Trengove and me setting out on an organised walk during our Hayling Island holiday. 
If you look at the back row of the walking party there are 4 young males. The 2nd from the right is Don; the 3rd from the right (not counting the little girl) is Alan:
and the 4th, (white flagpole in background) is me".

Picture from John Merlini via Patrick Williams