He is now of an age to match Cleggy and Truly in the latter episodes but he is clearly still very active witnessed by his continued writing for Still Open All Hours . A richly deserved Happy Birthday Mr Clarke!
I can only speak from the very few times I have seen him interviewed or spoken to for a soundbite and he seems to be quite a dour atypical Yorkshireman [no offence inferred] so I think he would require nurturing and coaxing to get some meaningful gems regarding what makes him tick.