Tower used by UK to tap into all calls to the Irish Republic

The Capenhurst Tower was installed by GCHQ to scoop up all telecommunications between the UK and the Irish Republic from 1989 until 1998.

The microwave beam from the BT cable under the Irish Sea, originated at BT's microwave towers at Holyhead on the Isle of Anglesey.

It continued through the BT towers at Gwaenysgor near Prestatyn in North Wales, Pale Heights near Kelsall in Cheshire on the edge of Delamere Forest and at Sutton Common near Macclesfield, Cheshire. It then joined up with the rest of the network down to the world famous landmark BT Tower in London.

[www.secret-bases.co.uk]