Ian, thanks and I know you build some pretty mean small blocks on your side of the pond also!!
As far as Crane rockers go, I have used a few sets on builds over the years with no issues other than one set that had bad adjusters. I have used Hughes rockers recently and like those too.
I'm not a big believer in roller bearings in a stock sized shaft rocker.
I have a set of Crane Golds in my wife's 440 that have been beat on in for at least 15 years. The wear area is still like New on the rocker/ shaft area.
Keith