Thanks monkeyalan I was searching for a decent photo but had no joy
I have arrowed the parts which I was trying to explain earlier so hopefully this will now be more clear
The top arrow is pointing at the start of the hose where it joins the main intake pipe
The middle arrow is pointing to where this hose goes into the top of the engine underneath the plastic cover which I have tried to undo and remove
And the bottom arrow is pointing to this same hose which is now going to the btoom of the engine (which cannot be seen)
It looks as though this pipe is one continuous line so I would assume it would all need to be cleaned or maybe even replaced

Let me know if you have issues seeing the photo as I havent posted any before!!!