Boulmer birding day 3 (lunchtime)

Spent 3 hours walking to the north of Boulmer, and some more fantastic birding.
On the shore near the village 5 Rock Pipits, including one which was noticeably paler with a stronger eyestripe - possibly a 'scandanavian' Rock Pipit? In one of the bushes I was surprised to find a Tree Sparrow. Nearby were 2 Twite, which perched for a while giving good views. Linnet and Goldfinch, as well as Meadow Pipit and Pied Wagtail on the grassy areas.
The next hour saw the tide come in rapidly and the waders pushed much closer. Initial highlight were 4 Purple Sandpiper in with the c100 Turnstone, Dunlin, Sanderling, Knot and Ringed Plover.

The above is a picture from my phone showing that the waders were within about 10m and really showing well.
Next, I found another couple of Purple Sandpiper, and in front of one a noticeably smaller, grey wader. Very Dunlin like on initial views I became excited as I noted the short bill, and then primary tips extending beyond the tail. This was looking spot on for adult winter White Rumped Sandpiper. The breast markings cut off to a clean white unders, with some streaking on the flanks. All I needed now was the rump. But as the tide continued to come in the birds began to move deeper into the sea-weed and I lost sight. Then a big wave came in scattering the 100+ waders in all directions. I never saw it again! Below are the notes from my notebook...

I'm leaving it as probable but it's difficult to say what else it could be.

The remainder of the walk was still very pleasant. 5 Wigeon just offshore as well as c20 Eider. A male Common Darter landed close briefly, making the most of the autumn sun. One field held hundreds of Curlew, Lapwing, Redshank and Oystercatcher. Zoom into the picture and check out all the blobs 😉

 A male Stonechat was nice, and finally, a cracking adult Mediterranean Gull flew over the village as I walked back to the cottage.