Just to bring this up to date
I bought the bike from Old Ned and after tooling around the village decided that it such a nice frame needed a bit of TLC.
Back in the day we sold Carlton Track frames and looking at the geometry, threaded seat post and lugs I thought it matched what we sold in the 70's. Back then Carltons were dripping with Chrome and the last Flyer frame we had was all chrome. This frame was black as a black thing.
Stripped a fork blade and under the black / blue / white was nickel and chrome.....
Stripped some more and the whole frame seems to be chromed, well it was but mostly nickel / chrome. The fork blade number was obliterated but the BB number is F8900. Searches say late 50's but they repeated the numbers in the 70's so I'll plump for 1971
I'll post a few more pics tomorrow but might just have to re-chrome the frame