Ok, my two pence...
Firstly, why replace the EGR? all it is doing is sending !Removed! exhaust fumes through your inlet, cough cough. blank it and be done with it!
Secondly, why pay £55 for diagnostics. get a cable and Vag-com light off ebay for next to nowt and you'll have enough to find out at least what codes have been stored.
Thirdly, if it is the turbo vanes then i'm not sure about your engine, but.. on my Leon that had the pre PD ASV engine the turbo vanes were sticking. i bought a tin of mr muscle and some thin tube and worked it free. it took some doing as had been a problem for a while but it sorted it after a few hours. TIP, dont use your thumb, that soon becomes painful and boring. i managed to find a way to get a massive extension bar on to the actuator and pump it with that.