Yes, Group Captain Hamish Mahaddie was indeed the chap who pulled together the aeroplanes for Battle of Britain, but he was also a Pathfinder bomber pilot in WWII, and he did the technical advisor role on other films too I think.
http://www.bombercommandmuseum.ca/s,hamishmahaddie.htmlI have watched the three or four episodes of this series that are on Youtube and was pleasantly surprised at how well written and made it was, considering the obviously limited budget of 1970's television. It seems pretty accurate from what i have seen, and very interesting and entertaining.