After-school nanny from October

Hello - we live on the ladder with two children - 7 and 4. We have had a nanny for four years, but from September, our smallest is going to reception, so we are now looking for an afterschool nanny.

The core hours will be 3.30 - 6.30 Monday, Tuesday, Thursday and Friday, during term time, with around four weeks of four full days (8.30 - 6.30) a week during the holidays (three weeks in the summer + another to be confirmed). There would also be ad hoc requirement for babysitting and other days - if possible. 

The girls go to school at Weston Park in Crouch End, and during school term, we would need our nanny to pick both girls up, bring them home (or take them to the park or the library) and give them tea. On Thursdays, they go to gymnastics at the Harringay Club. 

The pay is £12 gross per hour (core hours will be 12 hours per week, so £144 gross per week).

We would like someone who is energetic, playful and kind and who can cook. 

OFSTED registration would be a bonus, but not required. References essential.

Thank you.