The rule is NOT to give way to them. The regulations actually state that they have to give way to circuit traffic, so in theory they have to give way to us.
However, like others on here I'm more inclined to adjust my flight to accommodate them. I try to do this out of courtesy. However those pilots are not the ones paying for fuel, so they should consider the private owners who do. It still costs us to wait, and it sure can compromise safety if we are forced to change circuit direction to accept a tailwind.
Merv, as I've said before, your best defence is to look out. Put away your nav gear and concentrate on the circuit. Look above, below, closer, wider, extended legs of the circuit, straight in approach paths. Radio is great and can certainly help in the circuit, but don't think the aircraft on radio are the only ones in the circuit! If there is no Unicom or beep back there's no way of telling that your radio is working either. Saabs are big things, easier to spot than smaller types. They have two crew on board and (again, in theory) they should not have both crew head down in the cockpit.