@barnstormer1968
You might consider your local regimental museum. They will always provide a good home to military kit.
The 1968 pattern DPM jacket was made to the same design as the previous Olive Green jacket. IIRC the double lining was supposed to reduce the effects of flash burns from tactical instant sunshine.
For details of your local museum see:
British army museums and records at Army Museums Ogilby Trust
EG