British Portland Cement Manufacturers
of Portland House, Tothill Street, London, SW1
1911 A second attempt to unify the British cement industry. 33 companies were merged to form the British Portland Cement Manufacturers Ltd (BPCM) including a substantial number of plants outside the London area were involved. Together the APCM and BPCM companies now controlled 80% of national capacity.
1912 British Portland Cement Manufacturing Company London have taken over the works of Messrs Addison, Potter, and Son, Willington Quay; Messrs Cameron, Swan, and Partners of Jarrow, and Messrs J. C. Johnson and Co, Gateshead[1]
1920 Formation of a joint marketing company with APCM, Martin Earle and Co and Wouldham Cement Co, which would be called the Cement Marketing Co Ltd[2]
1928 New works was being constructed at Hope in Derbyshire which would be operated by G. and T. Earle of Hull. The company had more works than any other - on the North and South banks of the Thames and of the Medway, in Sussex, Surrey, Cambridgeshire and Middlesex, Bedfordshire, Northants, Yorkshire, Glamorgan as well as near Belfast[3]
1929 The Johnson Works at Greenhithe were being expanded. The company had consolidated its interest in 29 cement companies with total of 41 works, bringing the total of works controlled by the company to 58[4]
1937 Cement manufacturers [5]