Birds in a lagoon - Need help with ID.



Hi all. I have only started to take an interest in birds in the last year or two, so I'm still learning a lot and not always able to identify!

I've spotted these birds on a small lagoon a few times in the last month. I was thinking that the birds at the back may be some kind of plovers (Golden with winter plumage)?
I wasn't sure about the birds at the front either. They are very small. I think the legs are the wrong colour for Turnstones, so might they be sandpipers? Or something else I've completely overlooked?

Thanks!