Just a side note, if it does rain, the bit we had our first ever Ashridge meet has ample trees to hide under, albeit they have no leaves, but they certainly take away a lot of the rain. Just bring your WELLIES(!!!) and a good raincoat, and you'll be fine!
I'll try to get up real early on Sunday and give you a "live" report what it's like over here! Just check here before heading off.