To be honest mate, I'd wait...... the care and attention Paul took, especially not to damage the standard exhaust etc, and to ensure the fitment of the new one was bob on, and not touching anything like anti roll bars, was worth the wait alone......
I don't honestly think you will get that level of attention at ATS etc..... and its all luck with which numpty you get, and whether he was out on the p*ss last night.....
I'd book in at TDi, but thats my personal opinion. Wasn't dearer than ATS or anything anyway, probably cheaper!