Hi, First time I've ever joined a forum so all new to me so hope someone can offer some advice... 
I've been with my current Childminder for just over 6 years and she currenly has my 3 year old twins (start school in Sept). She has 2 yr old twins everyday from until 1pm and another little baby most days until late (except Tues). She collects my children from pre-school at 1pm (after lunchclub which works well with her new set of twins that leave at 1pm and fills her gap). My twins now have the option of going to preschool all day on a Wed - I do the drop off's on a Wed morning anyway, but despite me not needing her to do anything on a Wed she is saying that I should still be paying her? I'm a reasonable person and can see things from both sides, but I don't feel that it is my twins that are stopping her from being able to fill the afternoon, I think it's the twins she has in the morning that are doing that and that she is lucky that we've managed to work it that mine fill that afternoon gap until 3pm when I pick my other child up from school (she only had them for 2 hours from 1-3pm) as I do school pick up. Only exception is a Tues when she has them all day as she doesn't have the baby.
Am I being unfair in expecting not to have to pay for this? 