It did take a bit of digging for to find it as I knew it was somewhere. I tried AP1086 Sec 28 first but think the copies I have of that are just a little to ‘modern’ to list them (they are dated mid-60’s through 70’s.

I’ll have a further dig around to see if I can find any further information and try and scan the S.D.M. referenced.

Glad it’s going to be of use.

Regards

Dave