I've taken mine off by Andy's instruction, not too hard a job...
IIRC
Screw off the bit under the bonnet and discard this,
Unclip most of your wheel arch liner,
Unscrew the bar that obstructs the snorkel, (you will see this after you move the wheel arch liner out of the way)
then simply remove snorkel.
I found it a bit fiddly, mainly because i didnt remove that bar (strip of metal) soon enough, wont come out otherwise.
Screw the bar back in, replace the wheel arch liner and place your blanking plate in the hole.
Sounds better as you hear the air sooking more and a little spooling too!