In 1977 this took the form of the rolling "slow code" in use until April 2007, when BT's contract to transmit the time signal also passed to VT Communications, using their Anthorn transmitting station in Cumbria.
In 1977 this took the form of the rolling "slow code" in use today. On 1 April 2007 BT's contract to transmit the time signal also passed to VT Communications, using their Anthorn transmitting station in Cumbria.