EPW019209 ENGLAND (1927). The Associated Portland Cement Works and environs, Houghton Regis, 1927

So this was not at the time the Associated Portland Cement Works. It's clear that the large majority of Aerofilms images did not receive their "album titles" at the time they were taken, and were in fact only titled - often inaccurately - long after the purpose of the photograph had been forgotten. Another intriguing point: these were taken for and on behalf of the Red Triangle Group by Aerofilms acting as a contractor. So who owns the original image copyright - the custodians of the negative, or the successors of Red Triangle?

The Dunstable cement plant began operation in 1926 under the ownership of the Dunstable Portland Cement Company. It was acquired by the Red Triangle Group shortly after this picture was taken, in late 1927. After the collapse of Red Triangle in 1931, it was acquired by APCM. A third kiln was installed in 1937 and a fourth in 1966. It shut down in 1971.