Very sad to hear of this news as well. I'm also doing a run through of Only Fools and Horses and enjoying all his performances as Trigger.
Thought he was excellent as Lumic in the Cybermen story. It showed there was more to him than comedy roles and he could play it straight. It was a shame he had that accident and had to perform sitting down but it didn't affect his performance one bit, though it was a shame you didn't see him once he'd been upgraded. I thought maybe he could have been a more humanised upgrade like the lady in The Next Doctor which would have been better.
I also have as my text tone 'Alright Dave.'
Just superb!