Hi Clive,
The kits were universally known in the workshops as Makrolon kits, but as we know, that was actually the trade name for the plastic window material. The 'armour' material was actually layers of woven glass fibre moulded together with a resin. Awful stuff to work with as we had to drill it and often trim to fit as some kits were new, where as other kits had been used several times before. Even found a bullet lodged in a panel once.
In your last sentence did you mean RL (not QL) ?
regards, Richard