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Mix something old with something new at this vintage flea combined with a fresh flower market. The Royal Horticultural Society will be offering a weekend of workshops and talks to get Londoners excited about urban gardening. Stall holders will be selling pre-loved plant pots, furniture, retro clothing, jewellery and ceramics, as well as scrubs and unusual houseplants, while expert growers will be on hand to help Londoners with their gardening worries.