In pictures: Bawdsey transmitter block

1 of 6 Bawdsey Manor was the nerve centre for new technology that would change the course of the World War II

2 of 6 Robert Watson-Watt established the world's first operational radar station at Bawdsey Manor

3 of 6 Four transmitter masts could detect enemy aircraft up to 160 miles away

4 of 6 Once, a sealed doorway guarded against gas attacks

5 of 6 Four years ago the last transmitter tower was demolished

6 of 6 'T' block is all that is left of the Bawdsey radar station