Welcome to TZ-UK Dan. The CWC can be bought a few different places, but I would (like most everyone else here) recommend the PRS3 or PRS11. You can find them both here: http://www.timefactors.com/tfwatch.htm
PRS3 is quartz and upgraded specs from CWC SBS. PRS11 is auto.
The CWC can be had from Silverman's but at a premium.
Hope you enjoy yourself here. Have a look around. You'll find us very un-PC and very friendly. :D