Back in the 1980s I sat my professional exams in a hall at the Temple of Peace and Health in Cardiff. Then, it was full of desks and my imagination would never have run to it being used as a location for Nazis. But last night’s Dr Who did just that, time-travelling back to the 1930s. As is my custom these days, I could not follow the plot. Luckily, back in the (late) 80s I had more joy with the exams.