UPDATE:
I've managed to fit the new tensioner and chain at the weekend and it's totally eliminated the loud ticking/tapping noise! I'm so happy! It no longer sounds like a loud diesel!
I got the tensioner and chain from the Audi dealership in Bedford ....£96 for the tensioner!!
I went for the genuine parts as i'd heard from a few people that the ebay tensioners had a high failure rate and i wanted to play it safe.
I won't lie, some parts of the repair were a complete nightmare, partly due to my 2.0 FSI engine having LOADS of parts in the way of the cam chain case and almost all of them had corroded/threaded bolts in impossible to reach locations! Grrrr!!
The only time i needed a 2nd pair of hands was when i was putting the cam case back on, it was tricky to fit it back on with just one pair of hands, trying to compress both cams down ( the valve springs are strong) and fit the cam case at the same time.... no chance!
MarkpS3's guide was extremely helpful, massive thanks for the guide mate, it helped me out hugely!
After i'd changed the tensioner, chain, put new gaskets on etc.. i fired her up and she was a bit groggy for 20-30 seconds then the revs settled and the engine was running so sweet! I've honestly never heard it so quiet and smooth, it totally feels like a new car! It's been 4 days since i fixed it and it still amazes me how quiet it is! I purchased the car months ago and it was making the loud tappets noise then, so this is the first time i've heard it running quiet! I'm soooooo chuffed!
The next day i flushed the old oil out, replaced it all with Castrol Edge, plus a new oil filter as there was bound to been some sh*t fall in engine while the rocker cover was off, especially when you have to clean all the old sealant off.
Here's the engine sound before.....
And here's the engine sound after the tension and chain was replaced... almost can't hear the engine at idle!!
as you can hear, its a huge difference!