I also have a Nelson Longflap, although its main use has been on our tandem for centuries and the like.

Just before we left for overseas, I did invest in three bagman supports. Until now, we have used Topeak MTB racks as supports, but that was a bit messy, and the bags tended to droop on either side of the rack, so the Bagmans should help solve all that.

When scouting around for new panniers for our trip, I did look at the Carradice versions, but I read one or two too many bad reviews, mainly on the quality control, but also the lack of a decent closure on the rear pocket.