Thanks very much guys much appreciated!!
This technique worked great for the planner tracker. I now have another issue however, where I can't use the planner tracker and I'm having to use the standard point tracker, however when I create a blur node and use a mask, I'm trying to use the track data from the tracker using the connect to function, however whenever I do this the mask always moves position - this doesn't seem right as all I want to do is reference the track data to move the mask, am I doing something wrong here??
Cheers
Stu