I was watching "The Caves of Androzani" for the first time in probably 20 years (scary!) and the guy playing Salateen seemed so familiar... watched the credits and saw 'Glenister' and thought... that can't be the guy from "Life on Mars" can it? Yeah, definitely some similarity with the mouth and eyes, but did he change that much? Watched the next episode and read the name again, Robert Glenister, not Philip... so had to look them up, and voila! Brothers! I'd seen Robert in a few episodes of "Hustle" but never connected him to "Caves." Or to Philip, though now the family resemblance seems quite obvious.