I followed this guide and removed my inlet manifold today.
I was advised by the previous owner of the car (who had also had a garage remove the manifold) that the flaps where damaged and the car is also throwing a fault code so I did it in good faith.
Turns out though that after splitting the manifold the flaps where all intact, however they have lots of play, especially in the input mechanism. Its definably not airtight anyway..
Here is a couple of pics (open and closed) and also a video. If you have experience in this please have a look and let me know if its worth removing them and mapping them out now that I have the manifold out or if I should just leave them in after degreasing everything.
Perhaps the fault was down to the amount of play in the system?
Video:
https://youtu.be/gDPneDxKV8Q