If joining the circuit from the overhead and there is other traffic doing a 747 type pattern, I will politely enquire via the tower or directly if its A/G if they intend on staying in the circuit or are departing for Stavanger, I'm on the East coast of Scotland. If you cant see the other guy due to him making calls about being somewhere he is not, don't be afraid to be proactive in asking where he's at, what his intentions are and even suggest an order for landing i.e. take control. Communication is key especially at uncontrolled fields even if non standard radio phraseology is used in getting the info you need to reduce risks. They're are a lot of guys in the cemetery who were in the right.