Im sure Wiltons will be ok - its really hilly for starters, and the rain hasnt been that bad here, plus we've had a lot of wind which is drying the ground quickly.
Wilton isnt for a couple of weeks anyways, i dont see how they can inspect now - its meant to be better weather next week too.
LM should be ok as they are Hampshire and have had less rain than where I am (Maidenhead) and we are almost dry infact after the floods of Friday the ground is getting hard again! Hopefully the entrances are going to hold up as that is their problem