we bought ours from John Lewis. The lid warped within a month, very frustrating. I took it back to the shop, who were evidently aware of the issue because Nigella had prepped them with a whole batch of extra lids, apparently in expectation of my (and others') visits. I took the new lid home but this warped within only a few days. Life then became too short so I took the whole thing back for a refund, readily given. Shame, because it looks lovely - but with a warped lid, it's pointless!