I don't think he's done much TV work since he left Monarch of the Glen. I also seem to recall reading somewhere that he decided to pull out of a major stage play a few years ago.
I saw him in a horror film Cockneys vs Zombies earlier this year. He played a resident of an old folks home and for a lot of the time his character used a zimmer frame. I wonder if the character had been designed like that or was altered to take into account Mr Briers' health issues