It does say "Made In Britain"
Mind you Doug, that means nothing as it was quite common for UK companies to re-use US designs, as with the Eureka/Parnall, Eureka/Morphy Richards (Upright), GE/Morphy Richards (Cannister) and I have not had a chance to take some more Bylock pictures for comparison as I recall you said that their design may have been of US origin too
Al