Rated 5 out of 5 stars
It works and does the job pretty well.
It's not the Oxford Full British English; but you would be a fool to expect that for nothing.
Works in Thunderbird e-mail just fine.
Within generalised British spelling, they have accepted 's' or 'z' as a general spelling, it's common in Canada and Australia.
At least we don't have the American slang spellings to contend with.
Colour has a 'U' in it.
The Queen said so.