The man page for ispell indicates that to get British (as opposed to American) spelling I should use the syntax ispell -d british .
When I tried this I got the error:
Can't open /usr/lib/ispell/british.hash
and indeed there is no file “british.hash” in /usr/lib/ispell.
I have checked that I have an up-to-date version of the ispell package, and have google around (futilely, endlessly, frustratedly) for information as to how or whence I can get the file british.hash. Lots of Google hits, nothing that seems to be relevant. (Lots of stuff about Emacs, which I don’t use. I just want to use ispell in a stand-alone manner.)
Can anyone point me in the right direction? I am using Mate 1.12.1 under Ubuntu 16.04.2, if that is of any relevance.