Rusty, thanks. No, I hadn't got the answer, though I hadn't spent much time on it - mainly because it was linked to 25, which we didn't get to see. Your answer was great, but I'd never have worked out the Japanese bit!
Brendan, glad you didn't mind my remark. I thought you might have simply overlooked at 7 A. My brain works better in the morning, so I'm never able to help out much in the evenings!