Andy,
Yep, they must have turned up on Monday or Tuesday.
They were already encamped on Wednesday lunchtime when I went down.
Flew at the field on Thursday to maiden my Extra 300. As soon as they saw me the kids came running across the field. As you know (and I've just found out) maidening new planes is tricky and nervous and the last thing you need is three kids asking you questions while you're trying to trim out!
Saturdays wind will be from their camp, so they'll be directly below the take-off / climb out path, but fortunately the approach path should be from the left of field.
Pain in the backside...