dont know but if it is due to be run on the grass arena I would not bother. Will be good but IMO the grass is not established enough yet and it was rock hard all summer.
I remember them jumping some pony classes on the grass arena and people were pulling out because of holes and big open cracks in the ground right in front of the jumps apparantly
The grass arena was only put in earlier this year and last time I saw it you could still see throught what grass had grown to the bare earth. I am sure once the sward is more established it will be good but will take time.
their web address is www.westonlawnsequitation.co.uk (I think) normally have all the schedules available on line. If a December fixture would imagine it will be on the surface.