Tynus sighting

Yes, I know, these are probably old hat to the British Blake's 7 fans who know all these old series, but I'm having fun recognising B7 cast in the wonderful old programs of the same vintage I've been watching lately.

Spotted tonight was Ronald Lacey (Tynus) in the superb Porridge as 'horrible 'Arris, the sort of guy who gets thieves a bad name. Does he specialise in slimy characters, I wonder?