Monitored Approach Background
As far as I know, once the 747 classics retired, all BA fleets flew the standard BA approach, and I'm fairly certain the the chief pilot 747 Classic at the time regretted not having forced the issue when the NO incident occurred. Monitored approach turned out to be a rather good way of ensuring that both pilots were fully involved in the approach decision making, even though it had been developed (as has been said above) in the 50s as a way of ensuring appropriate visual accommodation nearing DH.
As for sub Cat 1 approaches being reserved for the more experienced pilot, it's true it could be said that's how it worked out, but it was only the outcome of a quite hard headed decision not to double the amount of Cat 1 and 2 training we would have had to do if we retained the option to have both pilots qualified to do both roles. I for one would never have dared to suggest that the RHS were any less competent than I was