Welcome . 1981 vintage, looks a tidy example
The third digit is a 1 so 1981
The W is for a Worksop frame and the B is the month of manufacture which is February
I was going to say 80's by the style of graphics and by the fluted seat stays , that was before seeing the frame number which has been said above dates it to 1981.
The Circuit was a low-ish end cycle from the late 70s into the end of Carlton. Very much a badge engineered Raleigh. Solid and dependable and worth spending a little time to bring up to parade standard.
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