I can tell you for pre-1852 (which was the big reform, when the whole system was overhauled) and can think of a few papers that have looked at the late 19thC. But I’d not know where to look for the 20th.

🥱 Yes, we know.

Interesting question! Nothing obvious springs to mind, especially as so few of the sources I use say anything about how numerals were spoken aloud!

Drivers of the world, road-price!