I assumed it was post 84, but not as late as post 95, but it was partly because it seemed to run out of sequence that I asked and I appreciate you answering.
I bought a Smock Parachutists today, label is SL31A or B, not sure which and it appears to have no first aid pouch so pre the 1984 introduction of this feature I think is correct, but post 82 as the earliest SL31's appear to be 1983 from your research. It is a named type, J Compton Webb and Sons. I notice that the headdress by them uses a different label from an earlier date, is it known if they had split into two different firms or just used different company names for clothing and headdress?