High Quality Content by WIKIPEDIA articles! The Highgate Wood Telephone Exchange was a telephone exchange built in the London suburb of Highgate Wood. It was the site of a trial for an electronic telephone exchange built by members from Joint Electronic Research Council (JERC), which was formed in 1956 and consisted of the British Post Office GPO, Siemens Brothers & Co. Ltd. (soon to be part of Associated Electrical Industries Ltd) AEI, Automatic Telephone & Electric Co. Ltd AT&E (soon to be part of Plessey), The British Ericsson Telephones Ltd., General Electric Co. GEC, and Standard Telephones & Cables Ltd. STC.