Many of the better engineering hand tool suppliers (e.g. Britool. Facom, Bahco, Stahwihle, etc) have always done these. If you want to buy British I'd personally recommend King Dick Tools who still make small open end wrenches in the sizes you are looking for (rings and combis generally start at 5.5 or 6mm with most manufacturers - below that you'd be better off with box/tube spanners or nut drivers)
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