I might have a go at cleaning the maf sensor first, but it will always be at the back of my mind so will probably replace it!

Will be interesting to see if you find any leaks, I keep going back to have a look to see if I cam find any but no joy :(

MAF's are very sensitive, I would clean the throttle body and then do a TBA with vagcom before touching the MAF.
 
You might want to check for splits in the PCV pipes under the inlet manifold to. They're well known as major source of boost leaks and a pain in the ass to.
 
Cool thanks for all the advice, I have looked for leaks there before but it all seemed ok, will have another look tomorrow when I clean the throttle body, if I remove the actual throttle body itself is there a gasket that I would need to replace and if so does anyone know a part number?
 
I cleaned out and reset the throttle body over the weekend and also the AIT sensor, it seems to be better on the power delivery and not as much hesitation if any, its the surging which is still the issue on light throttle, I'm going to have a go at making a boost leak tester and see if i find anything with that, i also want to clean/replace the MAF, if i run some logs on block 032 is it possible to tell whether the MAF is faulty? Its only the fact the i can think of better ways of spending £80 :) however if it potentially fixes the issues im having then its a definite must!
 
Right, so i made a boost leak tester earlier in the week which has helped me to find a split pipe under the manifold in one of the elbows, i decided to remove all the hoses from under there and check them all over just incase and so far as i can tell this was the only split that i could find, but the other hoses did look like they had past their best and cracking on the top surface, the pipe has since been patched up as best as i can until i can order a new pipe on tomorrow, not quite sure whether i will now replace all the pipes under the manifold, or whether i might try and install a catch can eliminating these pipes altogether?