This seems to be another case of finding a verdict for the verdict's sake without adressing the issues. For example, how 'au fait' were the US pilots with UK procedures and terminology. I know they were based in the UK, but from my experience of the US use of the UKLFS I'm not convinced in this case they had a full understanding of their own terrain clearance responsibilies. Under US procedures there isn't a Radar Information Service as such - so did the pilots understand what they were getting? There has been more than one incident in the past where confusion between systems has been a factor.