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I’ve got those - but I’m struggling to remember from where.I think it was from Magister Militum, perhaps the JR Miniatures range?
Sadly, I think you're right - JR Miniatures, available in the UK via MM as you say.(I say sadly, because I think they are no longer available, following a change of ownership at JR Miniatures. I'd like to be wrong, but I suspect not.....)