I'm guessing your bike was made in Australia from English parts.
I did a Google Image search for "1930's Australian track bikes" and found this:
http://www.bikeforums.net/showthread...k-Bike-Perhaps
Same lugs; head tube, headset, fork crown, seat stays, seat post and if not the same, very similar crankset, stem and bars. Underneath the orange paint was discovered the same black paint.
I vote for
Alvin Drysdale track bike.