I think they are both talking in Received Pronunciation (RP). At first I almost thought Dirac was mimicking the slight German tinge, but he was also a fluent Ge

I think they are both talking in Received Pronunciation (RP). At first I almost thought Dirac was mimicking the slight German tinge, but he was also a fluent German speaker so maybe this was natural to him too. I remember reading he stopped speaking German during one of the world wars so not sure if he still did at this point.