The girls are bickering less!  After discussion with MIL, I realised that I’m breaking up far fewer rows at the moment.  I’m wondering if, by limiting tv, I was actually forcing the girls to play together, as there’s not really any other choice, really, if they don’t fancy solitary play.  Surely anyone would argue if they had to spend that much time doing things together.  TV gives them the chance to do something alongside eachother that doesn’t interfere with the other’s enjoyment of it.  And of course they’re then refreshed and ready for another bout of playing together.