Originally Posted by
GadgetFreak
Not according to my recollection of the sign there on the clock. It said US Naval Observatory, Washington, DC.
Check it out this weekend if you get a chance

I wont get a chance to check myself for a bit. Im in the UK at the end of the month but in Cambridge and on a tight schedule. I doubt I will have time to get there.
Wouldnt be the first time I had a faulty memory, but I remember because I was shocked when I saw it since my expectation was the same as yours.
Well, I'm shocked, shocked I tell you to read that

In truth, it's some years since I've been to Greenwich, so my memory is probably more likely to be faulty.
So I had a quick google:
http://wwp.greenwichmeantime.com/info/time.htm seems to confirm your observations.
But it gets much, much worse. Towards the bottom of
http://www.greenwich-guide.org.uk/meridian.htm we find out that UTC is actually coordinated from France!
It turns out that we have our own atomic clock, as I'd thought, as do the Germans, you Americans and loads of other countries:
http://www.atomicclockrugbymsf.co.uk/Atomic-clocks.htm (although I'm not sure how up to date this is, as I thought our clock had been moved from Rugby to elsewhere...).
But none of this explains why the US Naval Observatory gets a credit at Greenwich