I have won three hardback OUP books;
The Concise Oxford Dictionary in 1992.
The Concise Oxford Dictionary of Quotations and The Concise Oxford Dictionary of Proverbs in 1996.
I have continued to send in weekly solutions but never won again. Perhaps I have won my quota. I have thought it strange that I won when Radio Times was the biggest selling weekly magazine at the time (there was just the TV Times as competition) and now, when there is so much more competition and the sales of Radio Times are presumably correspondingly lower, it is so much harder to win.