The Decemberists aren't coming any more. They've pulled their UK dates due to some half-explained illness:
With much regret The Decemberists have cancelled the remainder of our European tour. One of our band members is ill and needs to return immediately home to mend.
Our deepest apologies to all of our fans whom have purchased tickets to our forthcoming European shows. Unfortunately our calendar doesn't allow us to return to Europe at any point soon so please refund tickets at point of purchase.
Well, that's vague, then.