[Rob van Meel]

I see where I went wrong on this.
The back side of the contract card for WO contract S2831 had ahand written note on the back side which mentioned this number. Over the number it had indeed Chev, so presumably the original author wanted to make a listing of M?L (Morris Lorries, I assume) and Chevrolet next to each other. I'll delete the S/M number in the list.

Thanks for spotting this.