below is a list of great organic and biodynamic seed growers
i love the seed coop.definitely recommend.although i would say customer service is terrible i would give them a 1 out of 10 for that
https://seedcooperative.org.uk/
these guys are great and also have great customer service.really helpful
https://www.realseeds.co.uk/leeks.html
looks good,but i have yet bought from them
vitalseeds.co.uk
these guys look good although i haven’t tried any of there seeds
https://www.ethicalorganicseeds.co.uk/?gclid=CjwKCAiA-P7xBRAvEiwAow-VabWE6meVUuh1FFyir34jHAA7z_wI6ftIm5I1tne2cOKWP6cEjA22bBoCF90QAvD_BwE