It's a Carlton from the 1970s. With those wrapover stays and Crespera lugs it can't be anything else.
Most Carltons of that era were built with TI Truwel tubing but some Carltons were of Reynolds 531 and a small proportion of the high end models were hand built. This one was a factory-built frame - Carlton were making about 2,500 frames a week back in the day.
It's a Carlton from the 1970s. With those wrapover stays and Crespera lugs it can't be anything else.
Most Carltons of that era were built with TI Truwel tubing but some Carltons were of Reynolds 531 and a small proportion of the high end models were hand built. This one was a factory-built frame - Carlton were making about 2,500 frames a week back in the day.