There is a spelling mistake in one of the dialogue boxes.
Under the "Colour" tab in Preferences, you can choose the rendering intent. And it says "Relative Colourimettric" instead of the correct (even for British/Commonwealth English) "Relative Colorimetric".
Even though you in the UK (and we in Australia) spell "colour" with a "u", it is one of those "ou" words which drops the "u" when it becomes an adjective. Both the Australian Concise Oxford dictionary and the UK Concise Oxford dictionary list "colorimeter" as the only permitted spelling. Another such word pair is honour/honorific.
(The UK Concise Oxford is the one with the -ize endings. Sorry, I don't have a Collins or Chambers, but I think you will find the Australian Concise Oxford is close in most respects to standard UK spellings.)
Version 1.8.6 Mac App store.