Hello David, That link is not working for me but I think you have Bayliss Willey unit hub which came out in the early 1950's certainly available in 1952. BSA, Moyne and Harden also marketed these unit hubs the last mentioned used annular bearings. The great thing about the Bayliss Willey unit was its its immense strength and was particularly favoured by tandem users. This is a great piece of popular British equipment seldom seen nowadays.
Thats all for now. Keep those wheels spinning, in your memories if not still on the road. Be lucky Mick Butler Huntingdon UK.