Just had my mech unit replaced at vw for a total of 1600 all in, including oil etc. Bought my car not knowing the fault but it became apparent something was wrong when the car was hot. Jerking from a standstill and at low rpm, clunking gears and nearly stalling. I got 50% off goodwill from vw was the car is FWVSH so make that a definite when you come to buy as they won't even entertain any goodwill unless it's got that. Fault is completely sorted now and it's smooth as butter :)