Paddington Green, London W2 1NB. Open Saturday only, 10am-5pm. Half-hourly tours, last tour 4pm
Photograph: Vikki Ellis Photograph: /Vikki Ellis
493 Hornsey Road, N19 3QL. Open Saturday 10am-7pm, Sunday 10am-5pm Photograph: PR
46 Floral Street, WC2E 9DA. Open Sunday 10.30am-4.30pm, regular tours and some ballet demonstrations Photograph: D Burke/Alamy
54 Holywell Lane, EC2A 3PQ. Open Saturday 10am-5pm, tours at 11am, 1pm, 3pm and 4.30pm Photograph: PR
50 Berners Street, W1T 3NG. Open Saturday and Sunday 1pm-5pm, regular tours only, first come basis Photograph: PR
291 Mare Street E8 1EJ. Open Saturday and Sunday, tours at 10am and noon Photograph: Graham Turner
52 High Road, N2 9PJ. Open Sunday 10am-5pm; tours at 10.30am, 11.15am, noon, 12.45pm; screening of archive film 2pm-5pm; pre-book only for tours and screening Photograph: Will Martin
Kensington Gardens, W2 3XA. Open Saturday and Sunday 10am-6pm, first come basis. "Green Fingers" free drop-in family day on Sunday from noon-5pm Photograph: Hufton+Crow