British Family looking for nanny/maid

We are a British family of 4 living in Town square. We have a 3 year old and a baby who is currently 5 months. Mum is currently on maternity leave but will be doing some part time work from late August. Dad works full time, sometimes from home and sometimes out at an office.
We are looking for someone who can help maintain a very clean home as well as help with child care. Our eldest boy will be at school each day but there will be some childcare needed in the afternoons and on Saturday mornings for him. Our baby is looked after by mum most of the time, but baby care will be needed as she starts back at work from Aug/Sept and will hopefully be back at work more full time when baby is 1 years old (from January).
We'd also like someone who is comfortable cooking and preparing meals some/most of the time during the working week. We are happy to teach someone how to cook some of our favourite meals (sausages and mash, bolognese, that kind of thing!)

We have never had a nanny before so we are looking for someone who is proactive and experienced who manage both housekeeping and childcare comfortably.