In searching I can't find any indication that Honda 400 fours after the 70's models were ever sold in the UK (or US). They look interesting though I prefer the look of my CB400 and its air-cooled design. Of course, the later liquid-cooled models had a lot more power. I can understand why 400 fours were never popular in the USA but I would have thought the UK/Euro market would have been decent for the later 400s.