Hi Alan I cheat by downloading photographs of vehicles with the correct year number plate and edit/crop them using Affinity (a photo editing suite). I also manipulate perspective if the photo is taken at an angle. I've tried to produce my own but cannot find the correct Charles Wright typeface used up to the 1970s to download. This typeface has been progressively modified rather than give the new version a new name. I also looked at the online number plate creation site suggested by Adam in your thread, however I found the typeface is too modern (i.e. too square) for vintage plates which have more rounded letters and numerals for example G, O, 3, 8 etc. Talking of the Dodge Kew flatbed I came across this.