Never seen a spider with this pattern before
The depicted spider appears to be a European garden spider Araneus diadematus. The mottling pattern that forms a cross shape is probably one of the more distinctive features, giving these the nickname cross spiders. The distribution for your locale makes sense, based on data collected on these spp: http://srs.britishspiders.org.uk/portal.php/p/summary/s/Araneus+diadematus