Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,950 pages of information and 233,606 images on early companies, their products and the people who designed and built them.
of Wood Burcote Way, Towcester, Northamptonshire NN12 7JN.
1974 Manager J. M. Allen. Microwave materials: broad- and narrow-band absorbers; conductive rubber O-rings and gaskets; matched loads for waveguide terminations; microwave anechoic chambers; P10 foam for r.f. transparencies; specialised screens and radome assemblies. 
1986 Plessey Microwave Materials of Towcester had developed a lightweight radar absorbing material for aircraft