Speaking Clock - United Kingdom

United Kingdom

In the United Kingdom, the speaking clock can be reached by dialling 123 on a BT phone line; the number may vary on other networks. A voice announces:

"At the third stroke, the time from BT will be (hour) (minute) and (second) seconds"

For times that are an exact minute, "precisely" is substituted for the seconds portion of the announcement. Similarly, announcements for times between the hour and one minute past the hour substitute "o'clock" for the (zero) minutes. Other operators run their own speaking clocks, with broadly similar formats, or redirect to BT's service.

A speaking clock service was first introduced in Britain on July 24, 1936. The mechanism used was an of array of motors, glass discs, photocells and valves which took up the floorspace of a small room. The voice was that of London telephonist, Ethel Jane Cain, who had won a prize of 10 guineas (£10.50) in a competition to find the right voice. Cain's voice was recorded optically onto the glass disks in a similar way to a film soundtrack. The service was obtained by dialling the letters TIM (846) on a dial telephone, and hence the service was often colloquially referred to as "Tim". However this code was only used in the telephone systems of the cities of London, Birmingham, Edinburgh, Glasgow, Liverpool and Manchester. Other areas initially dialled 952 but with the introduction of Subscriber Trunk Dialling it was changed to 80 and later 8081 as more 'recorded services' were introduced and was standardised to 123 by the early 1990s.

The time announcements were made by playing short, recorded phrases or words in the correct sequence. In an interview with Manchester Radio in 1957 Miss Cain said:

The way I recorded it was in jerks as it were. I said: "At the Third Stroke" (that does for all the times), and then I counted from One, Two, Three, Four, for the hours, we even went as far as twenty-four, in case the twenty-four hour clock should need to be used, and then I said "...and ten seconds, and twenty seconds, and thirty, forty, fifty seconds", and "o'clock" and "precisely". The famous "precisely". So what you hear is "At the Third Stroke it will be one, twenty-one and forty seconds".

In 1963, the original device was replaced by more modern recording technology using a magnetic drum. The company that manufactured the rotating magnetic drum part of the Speaking Clock was Roberts & Armstrong (Engineers) Ltd of North Wembley. They took on the licence from the British Post Office to manufacture complete clocks for the telecommunications authorities of Denmark, Sweden and the Republic of Ireland, and a third (spare) clock for the British Post Office. This latter was installed in Bow Street, London. The European clocks were modified for the 24 hour system by lengthening the drum and adding extra heads. Roberts & Armstrong subcontracted the electronic aspects to the Synchronome Company of Westbury. The clocks were designed to run non-stop for 20 years. This system gave way to the present digital system in 1984, which uses a built-in crystal oscillator and microprocessor logic control. The complete apparatus comprises solid-state microchips, occupies no more shelf space than a small suitcase and has no moving parts at all. The BT service is assured to be accurate to five thousandths of a second.

In 1986, BT allowed Accurist to sponsor its franchise, the first time a sponsor had been used for the service. In the latter years of this sponsorship, it cost 30 pence to call the speaking clock. Accurist announced its withdrawal from the deal and the launch of an online "British Real Time" website on 24 August 2008.

During the Cold War, the British Telecom speaking clock network was designed to be used in case of nuclear attack to broadcast messages from Strike Command at RAF High Wycombe to HANDEL units at regional police stations. From there, automatic warning sirens could be started and alerts sent to civil defence volunteers equipped with manual warning devices. The rationale for using an existing rather than a dedicated system was that it was effectively under test at all times, rather than being activated (and possibly found to be faulty) only in the event of war. The signals to automatic sirens were sent down the wires of individual (unaware) subscribers for the same reason — a customer would report any fault as soon as it occurred, whereas a problem with a dedicated line would not be noticed until it was needed.

A version of the speaking clock was also used on recordings of the Houses of Parliament made by the BBC Parliament Unit, partly as a time reference and partly to prevent editing. On a stereo recording, one track was used for the sound and the other for an endless recording of the speaking clock — without the pips, as these were found to cause interference.

On the occasion of a leap second, such as at 23:59:60 on December 31, 2005, there is a one second pause before the beeps, thus keeping the speaking clock in sync with Coordinated Universal Time. The current source of UK time is provided, though not monitored, by the National Physical Laboratory, UK. Since 2003, the British speaking clock has changed voices four times. All changes have occurred on days when the clocks have switched from standard time to daylight saving time or vice versa. This is due to the fact that 123 is most commonly dialled on these days.

The speaking clock service is not available on the Orange or 3 mobile telephone networks, as they use 123 as the number for their Answerphone services.

The BT Speaking Clock receives around 60 million calls a year.

Callers from outside the UK and indeed in the UK can listen to the Pat Simmons version by dialing +44 871 789 3642