My friend did a course with one of those celebrity type florists, but she was living in London at the time. She said it was fab but very intense. I believe Ian Lloyd's courses are very good, he is based in Cheshire. I think some forum members have attended his courses

UK School of Floristry, Flower School, learn floristry, floristry training - Experts at Flower Arranging, Training and Tuition

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Sarah Creating Bespoke Wedding Flowers Cheshire