The Valiant's wing bomb bays were part of the concept during the design phase. I have seen an illustration where it appeared to be relatively squashed in cross section compared to wing tanks.
The typewritten Pilot's Notes of the early fifties do not mention it; the only early extra service available then was RATOG so it was defunct before it entered service. However, the ability to hang 12,500lbs+ on to a single point of the wing must point at there having to be some reason to make that position so strong.