I had gone back to the 'tuner' and they fiddled with the map (or they emailed it to someone to do it). Think they reduced the boost. seemed to work at first but the over boost issue still came back. In the end I got a refund and had the map taken off. I ended up driving 150 miles to R-tech for a stage 1 and no such problems now. made 250bhp and 310 torques with no mods. After 2 months of the Rtec I still can't wait to wake up in the morning to drive to work.
I also notice a big difference in the way the Rtech map delivers it's power - it's just more controllable and almost feels like the car left the factory like this (can still be manic when you want). No surges in torque or anything like that, just smooth power up to the red line.