Callan

The late 60s-early 70s series Callan came up on another thread. The title character was one of the first real anti-heroes portrayed on the TV. I had an older brother who was right into this show and I remember watching some of the later series with him. I ended up seeing the earlier series when they repeated the whole lot.

I came across this 2000 interview with lead actor Edward Woodward in which he says a lot about what made the series so special.