Second calendar year Turnstones in June in Cornwall

There was a maximum count of 18 Turnstones in Mounts Bay on Sunday.  Given the date and the condition of the plumage, these birds are not quite full adult birds, ie second calendar year birds which have not migrated north to the Arctic to breed.  Presumably they will stay in the area until next Spring.  Of interest I also saw two Sanderlings in similar plumage but all the Purple Sandpipers have now moved on.