Check and, if necessary, improve the hyphenation of “memorandum” in British English

[ghost]

According to The New Oxford Spelling Dictionary, The Writers' and Editors' Guide to Spelling and Word Division by Maurice Waite, 2005, ISBN 0-19-860881-0, ISBN 978-0-19-860881-3 (cf. an online library), page 313, it's

memo|ran¦dum
memo|randa
memo|ran¦dums

The 5th, 6th, 7th, and 9th printed editions of the Oxford Advanced Learner's Dictionary of Current English by A S Hornby also say

memo•ran•dum

Ideally, also the current version of these dictionaries as well as The Oxford minidictionary of spelling and word division should be consulted, but I don't have either of them.

However, the current LaTeX says memor-andum when running

\documentclass[british]{article}
\usepackage[british]{babel}
\begin{document}
\showhyphens{memorandum}
\end{document}

This is probably (?) an error and should be improved.

Discussion: http://tex.stackexchange.com/questions/691742 .