Thanks, gobs, for the link to the runner bean trial. I did find the RHS award reports for calabrese in 2010 and 2011 with no problem, and I also found a couple of calabrese trial reports that listed varieties tested but not selected for awards, but most of the reports I found didn't have that info. I was puzzled in particular to find no mention anywhere of Ironman. Given that it's such a popular variety you'd think it must have been tested, so I assumed it must have been tested but not awarded.
Maybe you're right, Mum, and it's just that Ironman was intended primarily for commercial growing so none of the seed suppliers submitted it for trial. DT Brown give it a glowing description though, so maybe I'll give it a try.