Here is the promised Slimbridge blog, in lieu of anything more recent as I have been mainly staying in working. I have missed Red-necked and Black-necked Grebes AND a Smew at Sevenoaks Wildlife Reserve - though they may still be there if they find an unfrozen corner I suppose. If we get a nice day this week I'll go down and have a look. Anyway. Here's Slimbridge, from November. We called in on our way home from a trip to Cornwall (a bit of a detour but not that much). Weather was horrid at first but got better.
From the Kingfisher hide, there were no Kingfishers but nice close views of a feeding station, though there wasn't much actually feeding on it.