Ceecee is further north than me. As far as locations go York is very easy for me, we always take the train and I'm guessing at 8 months pregnant with two little girls I'll be given a seat! Harrogate is a good choice, last time I was at Harlow Carr was about 48 hours before DD2 was born, let's hope I don't repeat that!
Lin, Thorp Perrow the week before sounds good. Are you around at the weekend or just during the week. Monday is my only day off work so I'm not the most flexible in August. Come September of course...