Try either of the Post Offices in Findon. They won't pass on the C77 Guy's details, but they may pass your details on to the Guy - if they know him. 01903 873364 Findon Village Post Office or Findon Valley Post Office 01903 872379.
If he lives in Findon Village the PO will know of him, as it's such a small comunity.
Findon Valley is a lot more spread out but worth a try. I used to live in Findon.....lovely part of the world....especially the 'Long Furlong' A280 which sweeps down from the South Downs to the A27 Coast Road........it's a magnificent fast A Road with stunning views.......I used to take a weekly blast along it to blow away the cobwebs. A big smile is guaranteed !