Have you ever been in a chorus of 5,000 people singing the words of an Indian takeaway menu to the tune of Nessun Dorma? Well, courtesy of Kit and the Widow, Susan Bullock and the BBC Comedy Prom, I now have. Of course, the delight of the Proms audience is that not only did everyone know the tune, but a large majority were able to sing it quite competently: it really sounded more than decent.