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At the same place that I saw a Eastern Crowned Warbler at back in 2009.
same bird that appeared on BBC4 a few months back where a camera crew followed the comings and goings of twitchers? Incidentally this programme can still be seen on the BBCs iplayer service.
Please see my Flickr photo's www.flickr.com/photos/129804972@N07/
I think you might me thinking of a White-throated Robin at Hartlepool, back in June 2011.
Lat/Lng: 54.9893, -1.3984
OS grid ref: NZ385662