It is time for the bar wars.
For historical/aesthetical reasons that refuse to die, the vertical bar (u+007c, | ) is displayed in many sets as the broken bar (U+00a6, ¦ ). In keysets that only support the English (US) national layout this is not much of a problem, but...
As things go, the broken bar symbol IS available in quite a few national layouts, English (UK) in particular. Your set, as it stands now, supports both English (US) over ANSI and English (UK) over ISO... but uses the same legend (¦) to represent the vertical bar (in each \| keycap) and the broken bar (in the UK-specific `¬¦ keycap). I would suggest using the vertical bar to represent... the vertical bar.
Also R3 \| , yadda yadda yadda...
EDIT: also, 4$€.