Hi Jenna - welcome aboard AiX. I have been watching your thread about Barton (in-the-Clay) over on Key and you have certainly mined a thriving thread there. I think you might get some interesting extra stuff come up over here.
Out of interest, C H Latimer-Needham was, I believe, a civilian educational officer at Halton before getting fully involved in his other aviation activites, including pioneering flight refuelling; I think he went to Canada. I believe that he also had something to do with design of the Halton Aeroplane Club's 'Mayfly' aircraft. Check out Richard Riding's book 'Ultralights', published by Patrick Sephens Ltd in 1987 (don't have the ISBN to hand).
I don't think you will get much help from the current RAF Halton because they will have little if anything going back that far, especially for the local ATC Squadron. Don't lose heart though, this is all part of the rich tapestry of research. You might find it helpful to join Air Britan, which will give you access to ABIX - Air Britain Information Exchange. They are real number nerds over there and you may well find that someone will be able to give you some help.
What will be the object of your research - a book?