Does anyone know the correct procedure for jumping the Chair in "Take the reigns" mode SO6 on the Aintree National course, I can jump successfully any of the fences except this one, I tried it fast/slow, tried popping it but I never manage to jump it clean, always only just make it or fall, any advice would be appreciated.

I have now worked out how to jump the "Chair" in the National, you have to ride into the fence and jump at the very last moment, too early you either fall or hit the fence