The main thing right now is that, unless you have a mild climate and a warm, sheltered spot, like against a south-facing wall, you will need to bring it indoors into a light but cool, frost-free place over winter. An unheated greenhouse or conservatory is ideal. They don’t need much water over winter and hate sitting in a soggy pot, but don’t like dry, centrally-heated conditions either! Here’s a quick guide:
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https://www.gardenersworld.com/how-to/grow-plants/guide-to-growing-citrus-plants-in-the-uk/