I nipped up for a quick look before work on Monday to find this gorgeous juvenile GND swimming about in the Marine Lake at Weston. For those unfamiliar with the spot here it is on Google maps.
There is parking along the waterfront for about 20 cars and plenty more parking fairly close if you can't get in there.
So far the bird has been present 4 or 5 days and it seems to strongly favour this location where it's been feeding on small fish and lots of crabs! My pictures aren't great but here are a couple anyway. Plenty more on the web including some great shots of it eating crabs!