Well made nest

This nest was lying underneath the young pines at the Maggot car-park yesterday. Those pines are pretty sparse trees and the nest would have been quite noticeable in there, this observer thinks the it might have come from somewhere else. Does anyone know what sort of bird will have built it? It is about a foot across with an outer ring of Silver Birch. Inside long grass, moss and what looks like wool or animal hair has been used to create a snug lining.