I tried to cue the video up in the link, but if it doesn’t work, that clip is at 2:37 mark.

"In our first series, it was Greek letters. But then people wrote in and said ‘we like the show, but we find that pretentious’. So we began Series 3 with an apology: "We’d like to say to everyone that’s been enjoying the show but found the Greek letters a bit pretentious, we’ve listened. It’s your BBC. You’ve reached out, we’ve heard you. Please choose…your Egyptian hieroglyph.