This is an interesting bird. Kevin Rylands has posted some shots on Birdforum, the best of which are linked here:
There's been a bit of discussion about it being a Little Stint but structurally it doesn't look like a stint to me and I believe it's now being reported as a possible Western Sandpiper.
With the shots being a little distant and inconclusive with regards to plumage (although is it still retaining some juvenile coverts?), it could be useful to see what we can get out of this bird in terms of structure.
Cameron Cox's excellent article on using jizz to help guide you towards an ID is useful here. There are several photos showing both species side by side and highlighting the subtle structural differences.
The Devon bird certainly seems to have quite a nice-looking bill for Western at first glance but it's still within range for Semip I believe. Here is a long-billed Semip from Cameron's article which is interesting to compare directly with the Devon bird. Bill length and shape looks similar.
Kevin's more distant profile shot actually looks the most pro-Western to me as it appears to show a large-headed, long-billed bird but, again, the more compact, less tapering rear of this bird bothers me a little for Western.
Would love to hear other's thoughts and links to more photos as they become available. I'm not sold either way so would be interested to see where this goes.
If anyone's interested, here's a discussion about a probable short-billed Western along with a silhouette slide highlighting back shape difference between the two species: