Oliver, offer part-time childcare in Seer green

I am looking for a nanny to help with my two school age children (8yr boy and 11yr girl) for an initial 3 month period. At the moment the starting date is tbc. Starting Monday 7th August, holiday cover, looking after them for about 12 hours per day (5 days a week, Monday to Friday) until they start school again in on the 4th of September (21 working days). From that date onwards (and the remainder of the 3 month period) it would be for collection after school (10 mins walk away for son and daughter will make her own way home from the secondary school bus), making sure they do their homework and are fed until I return from working in London at about 7:15pm (4hours a day, 5 days a week). There would also be the need for some light housework. The starting date is not yet finalised. Due to external circumstances this initial period might need to be extended into an ongoing arrangement.