Peugeot 306 hdi - help with air intake / inlet hose - scfc_151

Hi,

im looking for help removing the aluminium air hose to the inlet manifold. I have a leak there so bought a gasket to replace it.

I have undone all the bolts and seperated it from the manifold but im struggling to slide the air hose off the bolt threads. There is something obstructing it and stopping it from sliding off but I cant see whats stopping it. Theres not a great deal of room in this engine bay anyway but im wonering if something else has to come off like the vacuum pump?

The elbow joint im trying to remove should be seen on this leak

http://www.flickr.com/photos/38329634@N04/5234585343/

Any advise would be appreciated.