The brakes usually seize on the sliding shafts, not the piston. I have seen it on a few occasions so should be an easy fix. Remove, dismantle everything, clean everything then reassemble what you have using the right lube on the sliding mechanism. Come on, you are almost there!
Rob, its great to see people full of enthusiasm for the trackday. Makes it all worth while. I have just sat down after spending the afternoon working on the car. The head has been replaced, cleaned rebuilt and ready for install but its on hold as I need a new timing belt. Its expected to be here on Tuesday morning, then installed on the Thursday, running on the Thursday night. Biggest hassle is the tune. My tuner said I cannot play with the tune and stated that it could 'lean out' if I push the car. So, I am not out of trouble just yet. Once the car is up and running, I will see what I can come up with. Worst case scenario is having the car running at a reduced pace and boost but it will be there running in some form.
You can get to the track around 2pm but check with some of the other people travelling down to see if you can travel in convoy.
When I have a exact time, I will post when I will be at Campbelltown/M5 and ETA for Wakefield. I am hoping to cross paths with people on the way down.