Glyn
I suppose you have tried the obvious and contacted the 78th Halton Association Secretary for the whereabouts of Percy. I am in touch with others from the 78th, Rod Rumsby, John 'Spike' Castle (also coincidentally a pax on 579) and Bob Boothby. I feel pretty confident that something will turn up, there are over 500 other bods that have come together through my various websites.