It simply doesn't work, there's no two ways about it. You install it, but all spell checking is still in American English and the British English one doesn't appear as an option. Have tried installing it, uninstalling it etc... over a period of months or more than a year, so it's not a temporary thing.

Spellcheck is activated in the options menu, but doesn't work on any pages other than Google which does it's own spell check

This dictionary still doesn't work! Why are British people, and anyone wishing to use contemporary British English, subjected to using 'Carnegie simpleton' American spelling?

Do not work at all. I was forced to move to dictionary prepared by Marco A.G.Pinto.

This pack is added on my account but then checking, only the English USA version is shown. No options on the dropdown for this UK version).

It doesn't work. I am still being subjected to American kindergarten level spelling.