Checking and adjusting the cam timing on the 2.0 is not a difficult job, for anyone with a small amount of confidence.
In Summary:
1) Slacken off (but don't remove) all of the crankshaft pulley (E10) Torx bolts.
2) Using a 15mm spanner on the Auxilliary belt tensioner pulley bolt, turn the bolt clockwise, and hold it there. This will relieve the tension on the aux belt. Remove the Aux belt from a couple of pulleys, and then slowly release the Aux belt tensioner bolt to it's original position.
3) Fully remove the 6 E10 bolts holding on the outer crankshaft pulley, and remove it. It may need a bit of persuasion from a mallet (rubber only, don't use a hammer).
4) Remove the top cable tray cover, pop the cables out, and remove the cable tray. It's clipped onto the rear timing cover, and from memory there is also a nut in the middle.
5) Undo the relevent E10 torx bolts, and the 13mm bolt in the centre at the top, and remove the outer timing cover.
6) Rotate the engine on the bottom pulley bolt, only EVER in a clockwise direction. (nb, turning the engine anti-clockwise will cause the belt to slip!!). Rotate the engine, until the cut-out, in the bottom pulley, is lined up exactly with it's cut out on the engine. This will be at the very bottom, facing the floor.
7) Once you have the crank in this position, look at your cam pulleys. As you're FACING the engine, from the front of the car, look at the pulley to your left (drivers side). The INLET mark on the pulley, should be lined up with the cut-out on the rear timing cover. Now look at the other pulley. On this Pulley, the EXHAUST mark, should be lined up with the mark on the rear cam-cover.

Now look at the tensioner. This bit's pretty self explanatory, there are two marks on the tensioner backplate - NEW and USED, depending on what kind of belt you're fitting! If yours is set in this area, then you won't have a problem.
9) For good measure, look at the water pump. Is the raised bit on the water pump, installed in the recess in the cam cover? This can significantly affect tension.
10) If you need to adjust the cam pulleys at all, make sure you do so with a solid bar, and NOT a ratchet - this prevents the pulleys from slipping back under valve spring pressure. I strongly advise use of a Draper camlocking tool for this Engine, only about £6.
11) If all checks out to be well and good, or once you're happy with any adjustments made, re-assemble (reverse of taking apart!) and presume the problem is not valve timing related....
12) If there are any errors or omissions in this post, don't blame me, it's 02:30am, and I've had WAY too much cider

Hope this sheds some light, post back up if you're still having issues...
