 The incompetent vet Dr Chinnery is based on Tristan Farnon from  _"All Creatures Great and Small" (1978)_ (qv), as played by  _"Doctor Who" (1963)_ (qv) star Peter Davison (I) (qv). The  character is named after Dennis Chinnery (qv) who guest starred in  _"Doctor Who" (1963)_ (qv) on several occasions