It really is disspiriting to see just how much more we have to pay for the same items in rip off Britain. The 400mm f/2.8 at $11500 in the US costs $14600 in the UK, even our stupidly high taxes don't account for that level of disparity, and when that is multiplied across the whole range of camera gear then the rip off is enormous.
I think if I needed to buy one of these lenses it would be cost effective to hop on a plane buy one & bring it back with me!