Grace's Guide To British Industrial History

Registered UK Charity (No. 115342)

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 149,658 pages of information and 235,472 images on early companies, their products and the people who designed and built them.

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,919 pages of information and 233,587 images on early companies, their products and the people who designed and built them.

ADT Group

From Graces Guide

of Sunbury on Thames, subsidiary of a Bermuda-registered company.

1990 ADT UK Ltd became ADT Group Ltd

1996 Tyco International bought Thorn Security for £138million[1]

1997 Tyco International acquired ADT[2]. The Thorn Security business was absorbed into ADT and all but a handful of the famous red 'THORN' bellboxes replaced. However, the Fire products especially are still to be found in many premises and until recently spares and complete systems of Thorn heritage continued to be manufactured by ADT.



See Also

Loading...

Sources of Information

  1. The Times Feb. 14, 1997
  2. The Times Mar. 18, 1997