Neil it was very easy, remove the rear panel. Then literally two hose clips then if you feel on the underside of filler cap there's three nuts.
If your nervous about cutting the pipe try to twist it, re-positioning it to see if you can get a straighter angle first of all.
It worked on mine a treat, instead of 10-20 clicks at the pump now down to four, which I am more than happy with. That's filling up at the same petrol station too. I know some vary.
My car's up at the factory end of this month so I'll ask Mark or someone in Aero what their fix is too.
Not sure what the other pipe is, guess its overflow ?
