I was especially taken with the instruction to use imperial units (his bolding).

Not always that easy. Temperatures, for example. Neither Fahrenheit nor Centigrade/Celsius is am imperial measurement. The Réaumur scale was approved in Russia by the Tzars, so I suppose you could call that imperial, but it is probably not what he means.

But of course the scientific scale is °K, named after Baron Kelvin, who was Irish-Scottish. I suppose we will all have to switch to that.   " By 'eck, its going to be hot - they are predicting 250°! I think you will find that is quite cold really."