As predicted I have been unable to get hold of bloody TomTom! I contacted www.totalpda.co.uk support who were very helpful. He directed me to this page;
http://repair.tomtom.com
Fill that out and you can arrange for your faulty unit to be collected at TomTom's expense!!
He said that if your wired receiver has High Sensitivity written underneath it then its an old batch and they have lots of problems with them. Seems mine has packed up good and proper. I just completed the online form and was automatically given an RMA number and a phone number for DHL to collect it.
At least I'm getting somewhere now.
I thought it right of me to post the information I have found since TomTom obviously have a conspiracy to not mention any of these problems on their support site despite it being an extremely wide spread problem.
Hope the above helps some of you out.
Chris