"PEARSON" stickers appear to be diecut vinyl so likely not original (unless this builder had a very tight budget). Could have been bought from any sign shop that had a plotter cutter, might have been the previous owner's name but suppose it could be possibly a housebrand sold by that London (or Sutton) shop linked above, but not sure what frames they might have sold there in the '80s.
To me this has all the earmarks of a contract-built Italian frame/fork circa early to mid-80s, with the Cinelli CCM BB shell, Columbus DOs and ends, and Prugnat lugs. could have been from some shop like Vetta or a handful of others, but noting the plain domed stay and blade ends it was not fussed over by the builder.
What's the seat post size and what BB threading?