Amazon are selling the Casio G-Shock Gw-3500B-1AER watch for a decent price of £158 delivered. But (and thanks to simplyjimbo for this tip) if you sign up to receive information from Amazon's fashion store you get a 20% off voucher, which, makes this watch a "mere" £126.40.
You can sign up for the voucher here:http://www.amazon.co.uk/b?ie=UTF8&node=83450031&tag=hotukdeals-21
I understand that not everyone will be willing to spend this type of money on a casio watch, but it is the best price for this watch and the RRP is £250+. Plus its solar powered and syncs every night to an atomic clock so is always accurate. The only watch you'll ever need ;)