Looking for After School Nanny in London for 2 Children

We are looking for a nurturing and responsible nanny to look after our 2 little girls (aged 3 and 5 years old). We would like someone with a few years experience, references, and who lives near us in Westminster. We need 4 days of school pick up, preparing meals, keeping the flat tidy, and bath time. I would also like it if they can create structured afternoons with homework time, reading time and playtime or arts and crafts. Occasionally the girls may want to go to the playground or for a walk.