It is not surprising that parts lists, etc, survived because they who survive the service life of the vehicle and if notification was not recieved, they would not be destroyed. We actually had a workshop manual for a 1920 Dennis truck in the library, until someone rescued it for posterity.
These DME circulars were really a temporary notice, that once they were implimented then notice would be given for them to be destroyed, much the same as Mod. Instructions and Technical Instructions in EMER's, where early ones would be destroyed once all vehicles had been actioned, or amendments had been made to EMER. If oyu did not thin out this paperwork, you would be knee deep in irrelevant material. It is only now that we realise the importance, but in those days, who would have thought people would be resurecting these old machines?
DME's may have survived in another form, just remembered this example;
EMER Power S009 Misc. Inst. No.1 dated 12th Feb. 1947
Petrol Engines
Note; THIS IS NOT A NEW INSTRUCTION
This instruction was originally published as War Office (DME) Technical Instruction (Heavy Engineering) Serial No, H46, dated 19th May 1945, and is now published as an EMER for record purposes only.
It related to the emergency use of MT80 petrol in place of MT72, in small engines, used in Charging sets, generators, outboards and similar.
Richard