Ruby: in Australia do jws live in less affluent areas and if they do would this influence your figures?
I haven't checked, but I am sure JWs typically live in less affluent areas. However, I did check geographical data in the past, and JWs are spread fairly evenly across urban and rural Australia, but not uniformly. The distribution amongst the States suggests there are more JWs in States that are cheaper to live in. Qld has the highest concentration of JWs, and Vic has the lowest for a State (little ACT has an even lower rate, less than half the national average). Overall, I think residential address would be a result of income, not a cause of an income level, so I think it is a minor factor, if a factor at all.
also in jw families is it usually that if one parent works full-time the other does not work or works part-time and would this also influence your figures? in the UK more jws are working full time while most mothers work part-time.
I focused specifically on males of working age, to try to eliminate these factors.
* * *
If are after very specific data, and can describe it, very precisely, I will see what I can do. You would probably be better off going to the Australian Bureau of Statistics website, and going to the "Tablebuilder" page, and seeing what info is available. You can get a reasonable amount of info logging in as a "guest". I use a "Tablebuilder Basic" account, myself.
By the way, I would expect the trends in Aust and U.K. to be fairly similar, given the overall cultural similarities.