I got my 335th species in Belgium two days ago thanks to this 1st-year Siberian Stonechat which has turned up in Ostend. It was in the company of a few regular Stonechats and Whinchats and, from this angle, could easily be mistaken for the latter species. The pale supercilium is only visible head-on, however, and is virtually invisible from the side.
I'd only ever seen this species in Israel before and have never really made an effort to connect with one here. The first Belgian bird was recorded in 1993 and there have been just 16 previous records, so it is still less than annual, although one bird did spend all of last winter at the Belgian coast. This one has been here for five days so far so may also stick around for a while.