Thanks for the explanation and for taking the time to photo and post. much appreciated!
I was wondering what all the fuss was about. I opened my bonnet looked in each rear corner, saw the clear plenums, checked them with a watering can. all OK.
DIDNT realise there was a THIRD one hidden away, and thats the grief ridden one!
So just been out to check mine and its all clear (should i be able to see the road through it? ) and as an added bonus pollen filter shows no signs of flood damage
thanks again