Most illuminating, Jig Peter.
However my beef was the assertion that Bristol would never have F'ed up the RB211 in the way that Rolls did. My contention is that the Bristol engineers could never have known whether they would or wouldn't have done a better job, because they didn't do the RB211.
I'm neither sticking up for, nor denigrating either company. Just pointing out that saying they'd have done a better job is a tad hollow, because they didn't.