The Enigma of Backbone

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The Enigma of Backbone The enigma of Backbone has been with us for over 30 years since Peter Laurie first referred to the use of microwave relay towers in his 1967 Sunday Times article on civil defence. Three years later he expanded the article into the groundbreaking "Beneath The City Streets" in which he says "The GPO planned a chain of concrete towers code-named Backbone which linked the 3 major cities, as well as having connections with the air-defence chain". Unfortunately, whilst mentioning a role for Backbone in both civil defence and air defence he assumed that the system linked "secret sites", a belief founded on the mistaken, but perhaps understandable assumption that the civil defence sites the government said it would provide existed but because they could not be seen they must be secret. Unfortunately, we now know they they could not be seen because they did not actually exist. Later editions of the book largely dropped the idea of Backbone as part of a communications network for "secret sites" but continued to maintain, correctly, that it had some military function. Writing some 10 years later Duncan Campbell gave us some more details in "War Plan UK" saying that Backbone had been conceived in 1954 for a wartime role but with a peacetime one of feeding international communications into the US listening base at Menwith Hill. Both authors mentioned that microwave systems like Backbone would be less vulne... ... middle of paper ... ...he only other concrete towers are post-Backbone ones in cities - London, Birmingham, Manchester, Leeds and Bristol, or in the case of Tolsford Hill high on the North Downs near Folkestone. They would all be very visible to many people and this adds to the impression that the difference structures were dictated simply by appearance with aesthetics overruling function. Although Backbone is frequently mentioned in PRO files on home defence in the late 1950s it is hardly mentioned at all in the 1960s. It seems that the original Backbone stations became absorbed into a much larger microwave network and reports speak of "completion of the system which began with Backbone" and "stations supplementing Backbone". Files which give details of pre-and post-strike communications from the end of the 1960s do not mention it at all.

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