As pointed out, not a US model (light bracket on fork). The lugs are not Nervex, nor the god-awful ones used, at least in the US market, in 1973 on the Super Course and up. The head badge is not from the US market, either. I think the Carlton badge might have been similar in shape, but without the ruptured duck. I don't recognize it, but I'll bet it's a Carlton bike for the domestic UK market.