We have updated this site http://www.sitesaveronline.co.uk/quiz/ to now enable setters to submit answers to us on the site and a section to show any typos in current quizzes Hope this helps.
Having looked into this further I agree you are quite right, the number of letters in the answer should be 10. Unfortunately, one of our reference books gives 9 letters,
but having since looked at various references I find the answer is 10.