The chemical production division of the water purifying company, Permutit, was established near Talbot Green after WW2 (the company had been involved in the production of Sea Water Desalting Apparatus for war use). The company later changed its name to 'Purolite'. The building was closed and then demolished in the 1990s.

References:

Aerofilms photographs dated 1950
New Scientist, 2 June, 1960
Ordnance Survey historic mapping dated 1940-1960