
If he actually personally said people should use imperial, I'd like to know about it. But I'm guessing this is a rather made-up story... like, he happens to work at a place that issued it.
I spent 5 mins fact-checking, and discovered "The guidance was drawn up by Mr Rees-Mogg's North East Somerset constituency team some years ago." [Evening Standard] ...
So, I'm a bit skeptical.
( , Fri 26 Jul 2019, 20:36, Reply)

www.theguardian.com/politics/2019/jul/26/the-comma-touch-jacob-rees-mogg-sends-language-rules-to-staff
"The guidance, obtained by ITV news, was drawn up by the North East Somerset MP’s constituency team years ago, but has now been shared with officials in his new office."
( , Sat 27 Jul 2019, 10:44, Reply)

www.itv.com/news/2019-07-27/jacob-rees-mogg-style-guide-itv-news/
( , Sat 27 Jul 2019, 11:27, Reply)