Hi Clive, many thanks for that information.
I looked for those new words on the drawings, but could find none, so I’m not sure what version they are. I’ve not studied them closely, they might not even be the plans that the loco was built from, the seller (a dealer, not the maker) just gave me them as the loco is unfinished, as he had a number of Stirling Single drawings to hand. This looked like a complete set, until I checked later.
Sounds like I should just buy the current Reeves sheets to fill the gap. I’ll have another word with them and order appropriately.