Mr Syphic, top man! Thanks for the video.
Just removed and cleaned my DISA, 15 minutes start to finish. If you can change a wheel, you can do this. The torx fitting is a T40.
My car has done 66k, not sure if it's been changed before, but mine wasn't particularly dirty and although there was a little play in the flappy thing, it didn't give me any cause for concern.
Tip, remove the airbox lid, MAF and middle hose as one, just unplug the MAF connector. This gives max access to the lower DISA bolt.
Loads of access to the idle control valve, which I will attempt at the weekend, at a guess, another 20 mins.