British Portland Cement Manufacturers Ltd

The British Portland Cement Manufacturers Ltd (BPCM) was formed in 1911 as a subsidiary of APCM, the combined companies eventually becoming known as the Blue Circle Group.

The company was set up as a second combine, the objective again being "a complete amalgamation of the cement trade". This brought together most of the companies that escaped the APCM merger, as well as several significant new entrants. It was at this point that the incipient Blue Circle group began to function effectively as the industry leader.

The following table shows the makeup of BPCM in 1911.

Although separate accounts were drawn up and separate board meetings held as long as BPCM existed, the plants of APCM and BPCM were operated as a single organisation from the 1920s onward, and not distinguished in any way. Whereas only three of the APCM plants (Bevans, Crown & Quarry and Swanscombe) survived into the second half of the twentieth century, nine of the original BPCM plants survived, reflecting their generally better technical quality. The last of these was Shoreham, which shut in 1991. The G&T Earles organisation, as part of BPCM, acquired the Humber plant, and constructed the still-existing Hope and Cauldon plants which were initially part of BCPM.

BPCM was finally merged with APCM in 1965.