Seven of keyboards near me (of a range of manufacturers, also) have an unbroken bar to the left of 1 (including two MS keyboards) and three have a broken bar there (not counting another one which has broken bars in both places). My best guess is that the original IBM PC UK keyboard had an unbroken bar to the left of 1. Anyway, I don't know what ISO 9995 says, but I found an image from IBM...  (Talk)