Grand National winner Ballabriggs is back on track David Pipe takes Junior to Doncaster for his first run over fences this season, in the William Hill Grimthorpe Chase. He had a recent "sighter" in a hurdle, which will have done him good. This one-time ante-post National favourite looks ready for Saturday's task. Alan King is adamant that West End Rocke will not run on Saturday if the ground is not sufficiently soft. The gelding has had leg worries and King will not risk him so close to Aintree. Neptune Equester is another National entry. At Newbury, Aintree hopefuls Niche Market, Fair Along and Hello Bud all contest the Greatwood Veterans Handicap Chase. Niche Market, fifth in last year's National will be hard to beat. Paul Nicholls, his trainer, suffered a disappointment on Friday when Ranjaan, a 12-1 chance, was ruled out of the Triumph Hurdle after injuring himself on the Ditcheat gallops. Further revisions to the whip rules will be announced on Monday and come into force the day after, exactly a week before the Cheltenham Festival begins. Both the British Horseracing Authority and officials at Cheltenham are eager for the meeting to run smoothly and not be overshadowed by whip controversy. Paul Struthers, chief executive of the Professional Jockeys" Association is awaiting written confirmation of the changes but, save for one matter, he is happy. We're waiting for the final details to circulate to our members. "There remains one issue of significant concern for jockeys, but hopefully we can resolve that in time for Tuesday," he said.