P172 CEEFAX 172 Fri 8 Apr 21:14/25     FROM   NEWSROUND   ROSEMARY JUMPS INTO THE UVKNOWN   Jockey Rosemary Henderson will ride   into the record books e6jn before   the tape goes up for the start of   Saturday's Grand National.     At 51-9ears-old she'll become the   oldest woman kvjr to compete in the   race.     She'll bj riding her own horse   which is an outsider in the betting   and at 11, quite an elderly   competitor himself.     But with the National, a fairytale   ending can njvjr be discounted.   Contacts 176 PP Info 177 Sport 300 Next News Contacts PP Info PP Rjpts