Just watched series 29, the episode It's Never Ten Years, which was a tribute to Compo, showing previous clips of him in the show.
This reminded me of the episode in which 'See Ya Compo' is displayed on the hillside. If I can recall, in the episode Clegg is escorted to the hill-top to be shown the surprise. He appeared astonished at seeing the display. Was this written in the script, or was Peter Sallis actually taken to the hill only to be genuinely surprised. Either, that or he is one brilliant actor.