@FreddieMac: They used to have « Barda » galore at NBS not so long ago (I’d say max a year). I even used to think that their display cabinet upstairs was extremely boring because that was all they ever had on the shelves. Did you ask? I wouldn’t be surprised if they still had one in stock.
I rem they had lots Feb 2017... I think the some of those were still there when I was last in London Mar 2018.