Check the manual, the UK radio time signal (MSF) and the US one (WWVB) are on the same frequency but transmit slightly different signals, if it's been manufactured for the international market it may work, If it's been manufactured for the North American market only you'll be out of luck but they're not too pricey here.
I bought a Casio watch last time I was in the US that can receive MSF or WWVB and works with either.
David