@delia todd this is a Striated Thornbill. It's a bit soggy which may have confused people but you can see the fine striations on its crown and cheeks. Brown Thornbill would have the 'scalloped' edges running across the crown rather than along it.Oh no! What is it then?
I've just double-checked my thread and no-one said anything there. It was identified for my by the people we were staying with in Fleurieu.