'SM', 'S.M.' or 'S/M' and what it means!

[David_Hayward (RIP)]

I know that Supply Mechanical contracts were officially 'Demands'. I would suspect that 'S.' ones were from the Ministry of Supply and may also have been 'Demands'.

The series of S/M contracts (I can't call them Demands) seems to have run in series as we discussed previously:

S/M 1001 and up (e.g. Staghounds so armoured?)
S/M 2002 and up.. I have no evidence that there was a 2001 actually placed
S/M 3001 and up (possibly trailers and spare parts?)
S/M 4001 and up ??
S/M 5001 and up ??
S/M 6001 and up (overflow from 2xxx series I think)