Finally got it working!
After doing a hard reset, I put the SD card with Tomtom stored on it into the phone
Switched the phone on and it said "install application?", selected yes
Then I went in to Bluetooth and set it to Discoverable
Then went into Configuration > BT Serial Port and selected Com6 and 7.... it then asks you to pair to a device.
I switched on the GPS reciever and paired it with the phone as usual
Then launched Tomtom and it first siad "no gps device found", i went in to Preferences > Configure GPS and selected 'Other GPS device'
Then I switched the GPS reciever off and on again and after 10 seconds it picked it up!!
It took a week but worth it in the end