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Some rosemary varieties are only borderline hardy, especially if they don't have good drainage, so could be that. Drainage in the pot much less likely to be an issue of course.
Jekka's is the best for herbs if you want to buy new plants. Or take cuttings from any nearby rosemary bush that's doing well.
lemonade
I don't have an allotment but I do have a horticultural question. I planted 9 rosemary plants in a row in the hope of creating a low hedge in my front garden. All was fine for about 18 months but they have all died. They were culinary herb plants from Tesco. Is that my problem? When I wanted some from the garden centre they didn't have any so I bought fresh herbs from Tesco and planted them. They've survived two scorchio summers and failed their second winter.
Around the same time I bought a larger potted up ginger tasting rosemary from Waitrose and that's been in a proper pot outside and survived.