Yes I did some research and found catalogs. But, there was a gap between 1949 to 1955.The only real original parts are hand brakes GB and one rear caliper GB sport hiduminium and BB Baylis Wiley and B.W Track hub lug#RO6866.That what I have Frame has no extra brazed on for rear fenders.Does any of this help?There does appear to be plenty of subtle variations in Dawes head badges in that era, which possibly overlap in years, so even if you find a match, it possibly doesnt date yours anyway
have you looked here for other ways to date it?