Sorry, it's partly hidden by a post in front of the hide
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Black stripe on head makes this a Whimbrel!
Curlews often have a dark capped appearance like this bird. On rare individuals there can be a faint pale crown stripe as well.
Whimbrels have clearer stripes.
Interesting bird. My initial impression based on not much more than jizz was â€˜this is not a curlew' (therefore a Whimbrel), it just didn't look right. However having looked at the full size images I have no doubt this is N. arquata.