I can imagine some times when looking at your phone for the time, may not be allowed or sufficiently accurate for anything that requires an accurate time for legal reasons/evidence (it might also be used to ensure everyone's phones/watches are giving the right time sometimes)..
The GPS system is free and internationally recognised as accurate. There are also many free services from universities etc that provide over the internet atomic clock synchronisation.
Either is just as accurate as the talking clock and in fact GPS is used for scientific applications because of it's accuracy.
They employ 50,000 staff members, you are talking about 30p a year for each employee has been used on phoning the talking clock.
I'm sure it's a much smaller number using it regularly than every member of staff using it once...
Last edited: