I actually have a fair amount of experience with the L85A1 so I can probably say that both this and the M82 are the two 80's bastard bullpups I've shot the most. Anyone who's read my posts on this forum before knows that the A1 is the one rifle to ever come apart on me at a range (without a kaboom). I charged the rifle as we were instructed, this was a rifle I had used previously, and the rear butt plate cracked and sheered off causing the internals to spring out the back. Needless to say I was surprised and the range officer who was a scary gentleman for an 18 year old me was not the nicest man in the world about it. Having said that it was a structural failure of the rifle not anything I did. Now I never carried one on a two way range but I certainly had my share of range and exercise time with the A1 and I can say that it was problematic, although the sighting system was well ahead of the curve. I personally saw mags fall out of them, either from bumping the mag catch against clothing or just because it used a weak spring, for example. I have friends who served with the Paras and Royal Marines who say the A2 is a better weapon but I haven't spoken to anyone who really really likes it.
I watched the forgotten weapons series and really enjoyed it. As someone who is still deeply proud to be British (which in itself is a long story) I'd love a complete set of British service rifles from the brown bess onwards. It really disturbed me when I read the collector grade publications book on the SA080, which is well worth a read. It was a weapons system designed by committee and mostly by people who had never even fired guns before. I could go on and on but i'll stop there.
As for it being the reason that other commonwealth countries didn't keep to a British standard I think that ship had really already sailed after the adoption of the FAL. The Aussies were already looking for their own rifle/bullpup really before SA80 was completed and I doubt they would have gone with the British design in any case unless it had been something really special.
p.s. in summary the issue with the L85 compared to say the Vektor is that the British copied the AR18 without agreement to do so meaning that they really didn't have access to the engineer expertize or history (like the AK, galil, R4 like the SA's had) and so started from the ground up. They did this with sub par engineering, no idea on materials and then between the privatizing of the enfield plant and the political crap surrounding the time period the rifle was always going to be subpar. I always liken it to if someone was to ask me to build a corvette giving only me a junk yard for materials, no original drawings while someone was yelling at me and threatening to fire me all the time. Sure I might end up with something that kind of looks like a corvette but it sure as hell isn't going to run like one.