hansi wrote on Aug 22
nd, 2010 at 1:54pm:
"When renewing your Stolen Vehicle Tracking please note that there is now a replacment number to 0870 600 9990 to call with your Police Crime Reference Number in the event of your vehicle being stolen; please now ring 0844 561 9990 to speak to the dedicated Trackstar Operator"
So 0844 561 9990 replaces 0870 600 9990.
The database has a verified entry:
Trafficmaster Trackstar 0870 600 9990 01234 759502
This is also the alternative number suggested by CJT-80 above. Judging by the contact page this number is still a suitable alternative as it lists it as a number for contacting from outside the UK. I have added this to the entry.