Despite following threads various and having now spent two weekends sitting at the PC (much to the annoyance of the Management, who wanted me to help with a few household chores) I have consistently failed to get the CF GPS working.
Decided to bail out and ordered a Holux GR-231 BT unit from an outfit based in Taiwan ($80 for the BT receiver and a car cradle/charger) via E-Bay. Candy Hou, with whom I have corresponed by e-mail, was extremely helpful.
Sold the X5 and CF GPS to a work colleague (who is delighted) for £130. So not a total loss after all.
Thanks anyway you guys.
