Conversation overheard on the VHF Guard [Emergency] frequency 121.5 MHz while flying from Europe to Dubai.
Iranian Air Defence: "Unknown Aircraft you are in Iranian airspace, identify yourself".
Aircraft: "This is a British Aircraft. I am in Iraqi airspace".
Air Defence: " You are in Iranian airspace. If you do not depart we will launch interceptor aircraft".
Aircraft: "This is a 'Royal Air Force GR4 Tornado Fighter'. Send'em up............I'll WAIT" !!!!
Iranian Air Defence: .....................Total SILENCE.
I am lucky if I remember to turn the camera on and remove the lens cap!!!!, but I have a go.
I've seen the same thing several times. I live in the US so it's usually one of our planes that's referenced. I'm attaching a link from 2008. http://message.snopes.com/printthread.php?t=39907 the responses point out some of the inconsistencies with actual practice.