This has been soldiering on for a month or more but is now, at last, finished. The build blog is here:
https://srmg.org.uk/dinner-in-the-diner/
Warning though, if you do go there, the digital enlargements are cruel and the lining is nowhere near as ragged !
For those who just want photos however:
I was not able to find a prototype illustration of the coach in this livery anywhere and so had to rely on images of models for information about the positioning of the letteri