I've done many flights that probably count but am going to do another one and actually mark it in my logbook as "JAA CPL Cross Country Requirement".
Probably going to use an Arrow IV from Cardiff.
Cardiff to Caernarfon then across to Southend before flying back to Cardiff should be a nice day out. A lot longer than it needs to be but I've always promised myself a trip to Caernarfon and I know people who fly at Southend.