Childminder needed for two girls after school in their own home

We are looking for somebody to mind our 2 daughters (aged 6 and 9) after school. We would need our youngest to be collected from Educate Together school at 1.30 and the older girl will arrive home at 3.30 approx from the school bus. I would then be home at 6.30pm. The job would entail assisting with homework, cooking or reheating dinner, occasional playdates. The hours would vary every week and could be anything from 5 hours per week to 20. We would let you know the weekly hours a month in advance. We'd love someone with some experience who enjoys playing with the girls, but also would allow our older daughter her own space to read, play lego etc. as she's getting very independent! This would start at the beginning of September.