It was Series 12, Episode 13 (of 16). I was one of the lighting technicians on this series (and series 11 and 13 too). It was indeed the last series Richard Walsh played Sicknote in, along with Jim Alexander (Firefighter Joe Walker) - both characters killed off at the end of Episode 16 - though we had to wait until Series 13, Ep 1 to find that out....
as long as the fire fighters can stay on the run daughter or not if a member of the public is missing the fire fighters would happily help look for a missing person or child in a situation like this like i said if it was his daughter or not.