Georgia, looking for a nanny in Knebworth SG3

I am currently applying for a new job due to start from whatever date i set providing i can find childcare. It is potentially for the end of February/beginning of March 2023, the job is also very flexible. However, I would need childcare mainly for my daughter for around 20 hours a week, Mondays, Wednesdays, Thursdays/Fridays. Morning and afternoon (after school drop off time and before school pick up time) 3-4 days a week. I would also be interested in having someone that can look after my 4 year old son during half-terms for these same hours.