Nicky Henderson suffered a major a blow to his Cheltenham Festival challenge only hours before the meeting started on Tuesday. Britain’s most successful Festival trainer has sent out 73 winners at the four day meeting and has a host of top challengers this week. His number one hope is Constitution Hill, the unbeaten superstar hurdler, who will bid to reclaim the Unibet Champion Hurdle crown he captured in 2023. The Lambourn trainer has also won the JCB Triumph Hurdle seven times and had high