His most memorable report was on 14 September 1943. He broadcasted from a Lancaster bomber during a bombing raid on Berlin. Wynford Vaughan-Thomas gave an excellent description of the event and the people of Britain were entranced by his description of the plane flying through the searchlights of Berlin and the terrifying moment when the Lancaster was caught in one of the searchlights! He managed to convey to the listeners the dangers faced daily by RAF crews, and Wynford Vaughan-Thomas’s popularity grew.
You can hear him talking about his experience here
BBC Wales - History - Archive
I haven't been able to find a link to the recording.