Astonishingly, for someone as ancient as I am, I discovered this theme only a few days ago. Where have I been all these Christmases? Still missing the third name from the acrosses, and haven't yet sorted out which possibility for the top row, nor what is required when adding three bars. Doubtless all will become clear before too long. I see that the i will have next week's IQ on the Friday - shall the Listener perhaps appear in Christmas Eve's Times?