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Perhaps they are given ideas as to what to say, but I think what actually comes out of their mouths is entirely down to them. Look no further than JF as an illustration- surely no-one could feed her the lines she comes out with!
Welcome to the Forum Many Jane I hope you have fun here. I must say, for someone who doesn't like the slagging off on here, you've made a pretty good attempt at it! You should fit in very well!!!