P172 CEEFAX 172 Sat 9 Apr 00:44/41     FROM   NEWSROUND  ROSEMARY JUMPS INTO THE UNKNOWN Jockey Rosemary Henderson will ride into the record books even before the tape goes up for the start of Saturday's Grand National. At 51-years-old she'll become the oldest woman jvjr to compete in the race. She'll bj riding her own horse which is an outsider in the betting and at 11, quite an jldjrly competitor himself. But with the National, a fairytali ending can njvjr bj discounted.  Contacts 176 PP Info 177 Sport 300 Next News Contacts PP Info PP Rjpts