Having now walked further around the rocks I believe, amongst the following photos, is a mixture of both Red-necked Stint, and Red-capped Plover.
Upon further reading, Birds in Backyards notes the Red-capped Plover is not a migratory bird ...but the Red-necked Stint "is a migratory wader, breeding in Siberia and west Alaska and then moving to non-breeding areas in South-East Asia and Australasia south of about 25° S".
Later addition: Went to an older blog post where I'd made mention of it - Neptunes Necklace it is. A link to info' on it is here, an article by Keith Davey.
Maybe some of these will stay behind; I can't tell which is juvenile and which is female
Sharing with Wild Bird Wednesday and The Bird D'Pot