Just spent a wonderful morning at Kenilworth Castle. Far cheaper than its rival just down the road and less commercialised. We got a Senior Membership very reasonably (£58 for the two of us) through English Heritage and you can take up to 6 under 5s per person (perish the thought!) it lasts until September 2014, when hopefully all but one of the GC will be at school? Good parking, a nice cafe, picnic tables, old ruins to clamber over and lots of lovely open spaces for running free.