John Collin (actor)
John Collin (18 October 1928 – 25 February 1987) was a British actor frequently seen on UK television during the 1960s and 1970s, mainly in supporting roles such as ITC's "The Saint" (S5/E21). Collin's best-known role was as Detective Sergeant Haggar in the long running BBC police series "Z-Cars". Another notable role was as Guardian officer Tom Weston in the 1971 ITV political fantasy "The Guardians". He also played Mr. Alderson, the father-in-law of James Herriot, in both the television movie "All Creatures Great and Small" and the subsequent television series