Investigated the problem today and found that it is the EGR pipe which has a crack right through the centre - went you give it some unleaded it blows harder than the Cape Doctor - not a spot of dust anywhere in the engine compartment

So a temp solution tomorrow is to use a standard gauze bandage and some gumgum to "patch" the problem till I find time to drop the car off and have it fixed.
Anyone have any input on how important this thing is. I see lots of discussion about blanking kits???
Do I need this EGR pipe or can I blank it off?