I received this notice:

__________________________________________________ _________
NPL Time & Frequency Services
Notice of Interruption MSF 60 kHz Time and Frequency Signal

The MSF 60 kHz time and frequency signal broadcast from Anthorn Radio
Station will be shut down over the period:

13 December 2007 from 10:00 UTC to 14:00 UTC

The interruption to the transmission is required to allow maintenance work
to be carried out in safety.
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See:
http://www.npl.co.uk/server.php?show=ConWebDoc.1001

Cheers,
David