Nanny 5 days a week in afternoons

We are a family of four that have recently moved to Sutton from Australia. We have two boys aged 9 and 11 and have busy jobs which makes it difficult to juggle everything. We are seeking a nanny who can help with the afternoon/early evening shift mon-fri. Key activities will be making sure the boys arrive home safely, do their homework and chores, get to activities, prepare dinner etc. We need someone who can be an extension us, managing the things we would be doing if we had the time. We are a kind, warm and happy family and the boys are really well behaved (most of the time!). We are looking for someone that can become part of the family and is flexible to work around our schedule. It would be great to have someone local with a car.