I'm also in Suffolk and in pretty much the same boat.
My 2.4 Brera runs lumpy on start up, I've cleaned the EGR, intake manifold, and inlet valve, and fitted a restrictor plate to the EGR.
Initially my lumpy start disappeared for a couple of days but is now back, so I'm thinking of fitting a blanking plate and having the EGR mapped out, I'm contemplating locking my swirl flaps open myself, as opposed to stripping the manifold off.
AutoLusso in Dunstable has also been recommended to me, but I plan to give Alfashop in Norwich a call for a price on mapping the EGR.
Ideally it would be good if there was some one in our area with Multiscan that could map out the EGR for us.
Blanking the EGR is easy and I'd be happy to help you with that if needed.