Hi we are about to leave the uk with valid australian passport but our kids uk ones have expired, one hasn't got a uk passport at all but does have an australian!!! has anyone been there and if so how did customs recieve you? were they horrid or did they not really care as long as you are leaving? if anyone can help i would be realy grateful for some info. Thanks in advance.
Lizzard.

You'll be fine. The airline won't have a problem as they can enter Aus on their Aussie ones, and Customs & Immigration won't care. They would even OK to enter the UK on their Aussie ones