48 hour declarations on the flat these days Chelsea and a lot can happen after you have declared. Add to this the fact that you cannot always trust the going reports issued by the clerks. Most late declarations will be due to ground and they will be late in the day because the trainer either has only just got to the track or because the feedback from jockeys regarding the ground will contradict what the clerk of the course has stated. Most of these will be for the welfare of the horse......I could go on.