I am a CDO. Those who have to use my service will know what I am and where I am. I would never dream of giving aircrew a hard time. English is often their second or third etc. language . I struggle at the best of times with English. If a mistake is made on readback, I will make sure it is corrected without any verbal hassle. I want the cockpit crew to leave my freq happy and relaxed in the understanding of their clearance. If They call back to confirm again, I will always thank Them for doing the right thing. A happy pilot,going en-route, makes me feel I'm doing my job. Reading back over this reply makes Me sound a bit An-l. So feel free to shoot me down until YOU give Me a call. Regards EGGX.