'Tis easy to fix. Get yourself onto http://www.cyca-online.org.uk/
and go to the "Sail Number/Handicap" bit. Make a guess at the answers or phone up the office - mornings only, I seem to recollect, but I may be wrong. You pay your money and get a smart number with a "C" at the end, much more classy than "T" or "R"! Then a wee chat with Diane at Owen Sails and another dod of wedge and sticky numbers will be in the post.
Enjoy WHYW - it's a lot of fun!
Oh, and you can contact Julia at WHYW and let her know you are coming and she'll happily take your entry money with the handicap/sail number to follow.