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Reference.org
Y service
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<p> The "Y" service was a network of British <a href="/facts/Signals_intelligence/Iwzvw6AW">signals intelligence</a> collection sites, the Y-stations. The service was established during the First World War and used again during the Second World War. The sites were operated by a range of agencies including the <a href="/facts/British_Army/StuY9Jy2">Army</a>, <a href="/facts/Royal_Navy/Xdy8YCH7">Navy</a> and <a href="/facts/Royal_Air_Force/P10CbL5H">RAF</a>, and the <a href="/facts/Foreign_Office/QQqx2MwF">Foreign Office</a> (<a href="/facts/MI6/oPppIz3x">MI6</a> and <a href="/facts/MI5/mI3nc0YP">MI5</a>). The <a href="/facts/General_Post_Office/gnMB2RHN">General Post Office</a> and the <a href="/facts/Marconi_Company/M3gV8oU8">Marconi Company</a> provided some receiving stations, ashore and afloat. There were more than 600 receiving sets in use at Y-stations during the Second World War. </p>