Much like the linked post for Willie Mullins Novice runners, I do realize that this isn't a strictly French Racing related post. However, having put the time in to do the study, it seemed important to make it available and this is the best means that I have for sharing the data.
There is a link to the PDF file below which follows the same pattern as the Willie Mullins post, looking at the runners for Nicky Henderson in each of the Cheltenham Novice races since 2014. The PDF contains basic data on how they were prepared for the festival, where they were sourced from and how high they ultimately reached. For this piece, I have omitted the National Hunt Chase as I think that the unique nature of the race and the quality of the jockey chosen to ride has more of an impact on a horse's performance than this data does.