Well after working under the metal bracket today looking into how to attempt the N248 removal I came a accross something new that I never knew before and as thread title states it is the N211 valve. Now I can clearly see it has a 'dial' on it and I have read that is has something to do with the cold starts and vaccums. By twisting the dial what exactly does this achieve because I think I accidentally turned it today when working on the car. I don't know which was I turned it but as far as I know I did. Cheers guys!