It means the wait will go on to see reigning Champion Hurdle king and unbeaten superstar Constitution Hill.
He was due to kick off his season in the rearranged Fighting Fifth after it was swapped from a cancelled Newcastle last weekend.
Henderson wrote on X: “Due to the extremely testing going, we have decided that Constitution Hill will not run in today’s Fighting Fifth at Sandown because it would simply not be fair to race him under such extreme conditions on his first run of the season.
“It is too close to Boxing Day, and he can’t do both, so, all being well, he will now go straight to Kempton for the Christmas Hurdle.
“Shishkin has also been withdrawn, along with Willmount for his intended engagement in the Listed Novices’ Hurdle.
“I will speak to JP with regard to the participation of Impose Toi and Chantry House, but the good news is that Jonbon will take his chance in the Tingle Creek.
“He has had a run so is fit and well and the ground is much more suitable on the chase course.
“It is very unfortunate, and we are all sorry they won’t be turning up, but we have to put the horses first.
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