Well, it's not much of a big deal OP, most pre-WW2 warships were very deficient in terms of AA capability, and given Axis air power in the Med, the British were lucky they didn't lose more ships than they did. Still, the American cruisers were likely to be put to use where aircraft were less of a threat-the far flung shipping lanes of the vast British Empire. I would think that there would be little question about how the British would use the American heavies. The Brits had many sea lanes that needed patrolling and convoys that need to be protected from raiders, and German raiders proved quite a nuisance during 1940. But why did they specifically want the American heavy cruisers? The last British heavy cruiser completed was the HMS Exeter back in 1931, and she was a "stripped down" version of the earlier Counties. Even after the end of the restrictive naval treaties, the British stayed with the light cruiser instead of switching back to producing more heavies. I can only surmise, that even they didn't want the American Omaha class CLs, and rightly figured that the Americans would not trade away their new Brooklyn class CLs. Thus, the only option would be the American CAs.