In reply to Matt Vigg: My Missus was looking at the Kong Sierra Duo:
http://www.kong.it/doc/KONG_SIERRA.pdf
Quite a few different full body harnesses on their site, although, like the Petzl and Edelrid, none of them really seem to have much in the way of comfortable padding as they're essentially work harnesses.
Interestingly, there's a couple which do have waist belts, but also have the full-body shoulder straps and the high tie-in point, which might work if you leave the waist belt loose? I don't know though!