> The Radio 4 time signal pips used to be produced by the RGO time service,
> so they were also a means of broadcasting official legal time. The Radio 4
> long-wave transmitter also was and remains a frequency standard. However
> since the RGO's time service was terminated the BBC have generated the
> pips themselves from GPS.
There is also a phase modulated code on top of the BBC Radio 4 long
wave transmission that includes the UTC time, up to the minute.
http://downloads.bbc.co.uk/rd/pubs/reports/1984-19.pdf
Though I guess this is provided by the BBC rather than the NPL. The
French have something similar on top of TDF.
David.
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