Thanks for that KtK. There was always a bit of controversy regarding the later grease v the earlier grease. The old XG340 was actually a thick, pasty graphite grease - or grease made from graphite, with an oil mix that left it quite thick. The later 264 was actually graphited grease! In other words, it was another standard lubrication grease with graphite powder mixed. It had a runnier texture and, so said, not as effective, If you get a chance to squeeze a bit, have a look and feel.
With Bren return springs the 340 would stick like 5hit to a blanket as they say whereas the 264 (strange, I always remembered it as 249 but there you go...) got hot and runny. Ideal for mini ball-joints and all CV joints though
Don't forget the golden rule....... If it slides, it's graphite. If it rotates it's grease