I'm with Footman James and yes they offer £100 off with Tracker (that's fitted to my QP5 '08MY) Found the Fob in the glovebox with flat battery, changed, and checked with Voodophone to see whether they could re-establish the account. The Fob shows the account it belonged to on their database. They reckoned that, even though I moved to top of Blackheath the system was disconnected. They wanted over £500 to get it reconnected and working via one of their "agents".
When working, the system will transmit a higher power location signal, switched on by Tracker's control room.
When working in the Met as a dispatcher had experienced both good and bad from this system. One classic yankee was reported stolen and said to be around the Tilbury area -- found to be in a container waiting overseas shipment. Not bad for being totally shrouded by the container...
OTOH, the location given by their control room to us could be wildly out from triangulations given by the cellphone masts' locations.