simongraham, the article is pretty much a good article although some fixes are needed, see the comments below. I have also left some suggestions along with it which you can adopt if you want to. On a general note, I personally think the prose overall could be better, it reads a bit informal at times. In any case, good work on the article, I'll promote it once the fixes are done. Tayi ArajakateTalk15:01, 9 July 2021 (UTC)Reply
The lead shouldn't need to mention "in Leyland, Lancashire." Seems to imply that the truck was solely produced in Leyland. Was it even produced in Leyland? If there are other plants which produced the trucks or the CKDs, it should probably be mentioned in the production section. I would suggest splitting the lead into two paragraphs as well.
There is a stray "[" after Scrammel in the design and development section. Also, probably should state the entire name Scrammell Lorries. Too many also's in the first paragraph of the section which makes the sentences sound awkward. I would suggest rephrasing.
Many of the sources don't appear to be open access but I haven't seen any instance of original research in the ones that I could access so I'm going to assume that there are no issues with original research.