Get a GW-M5610U, the price is going to be more like a hundred quid (they're 99 at Argos right now), but you get all of the bells and whistles. Solar means you don't have to think about battery life, just leave it in the sun when you're not wearing it (great for an occasional beater), atomic means it synchs with radio signals daily so will always be accurate, and the most recent U model allows you to switch the date to 29-2 rather than 2-29, which is a small thing but a surprisingly nice one if you're not an American! I had a Gw-5000 for a good while, but I went back to a 5610 because I think it sits better on the wrist being a touch lighter (OK, I did switch mine onto the strap from a GW-5000, because they're softer than the normal 5610 strap). I think the 5610U is almost the perfect G.