I know what you mean Stu - I get the impression the only times Marvel allow Cap to be a real power player in the Marvel Universe is when Alan Davis wants to use him as such; Maybe it's down to his not being American?
I 1st had suspicions when I saw in the Official Handbook of the Marvel Universe that they list him as something like 5'10" with the strength of an average man
without the suit (no ability to fly wither). Now you and I both know that this is complete B.S. but it came as no suprise considering his entry comes immediately after Captain America's entry.
They couldnt possibly have a limey outdoing good ole' Cap America in the physical attributes or powers stakes, could they?!
Call me cynical and paranoid but that's honestly the way I saw it.
EDIT:- Here's a link to C.B's entry on the Marvel Directory. Seems they
still havent changed to the errors that were in the Official Handbook.
Now why would that be?!
http://www.marveldirectory.com/individuals/c/captainbritain.htm