I've compiled a list of the UK and Irish seed and plant sites. These are generally for smaller or family-run businesses that include Heritage or open-pollinated varieties in their catalogues. Several list organically produced seeds.
Beans and Herbs https://www.beansandherbs.co.uk/
Brown Envelope Seeds http://www.brownenvelopeseeds.com/
Chiltern Seeds https://www.chilternseeds.co.uk/
Garden Organic http://www.organiccatalogue.com/
Irish Seed Savers Association...
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