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H+H's Celcon Blocks High Strength Grade (7.3N/mm2) are used principally where higher compressive strength is required such as in the foundations and lower storeys of three storey buildings, piers under high vertical loads and in multi-storey buildings. £2.5 per block (£90 all) Central London, Hackney N16. Collection Only Location Albion Road, London, Greater London, N16 9PD what3words