Apparently back on near side this morning:
https://mobile.twitter.com/Burnhambirder/status/1346412185212379139

KP showing on the beach at the north end of Stert Island this morning- viewable from Burnham… 2 hours after high tide.

Yes, it applies to those, plus cheddar & all the Avalon marshes (ham wall murmuration etc)

All packed & ready to head to Burnham on Sea in the morning when I was reminded of tier changes. Burnham is Tier 4 from 31st, so no visits to the Kentish Plover. I suspect this also applies to Steart & Apex park too.

Sorry for the gloom, but it may save someone a hefty fine!

KP seen well along the beach at Burnham this morning, 2-3 hours after high tide. Best viewpoint by lifebelt just north of yacht club… with c40 Ringled Plovers and later a flock of Dunlin…

Seems to have been reported from huntspill, as well as Burnham beach today:
https://mobile.twitter.com/berrowbirder/status/1343908997255098369

Kentish Plover seen at 13.55 Today at North End of Steart Island with 4 Ringed Plover then flew with about 45 Ringed Plover and 6 Grey Plover. Also 8 Avocet seen. Stephen Curtis and Carol Rushton

From Avonbirding - Burnham / Stert Island:
That Kentish Plover is still being seen from time to time way out on the mud flats - reported today

13-March-2020
And still present this morning per Twitter.

10-March-2020
A Kentish Plover was found yesterday on Stert Island by Andy Slade, presumably the same bird that he found here on Boxing Day 2019 and that had over-wintered. I saw it this afternoon at low-tide in the same place, distantly from Burnham sea-front, feeding among a small flock of mostly Dunlin and a few Ringed Plover, after it had been located by Roger Musgrove.