Free room in exchange for limited childcare

We have a beautiful room in a gorgeous Edwardian house available for someone who would be able to help with childcare (~15 hrs/week).
We require someone to do the following three times a week, probably Monday, Tuesday or Wednesday and Thursday:
Get our three children (Albert 11, Stella 9, and Clement 6), up and dressed, give them breakfast and take them to school. During the day prepare their dinner and tidy up breakfast. Then collect them from school, take them to any clubs and then give them dinner. We have a cargo bike to cycle them to school so you need to be confident on a bike in London traffic.
There is the possibility of paying the correct person for the other day.
We would also like a little light housework (to stay on-top of the kids mess!) and one babysitting night a fortnight (although again flexible). We are very relaxed and can sort out the finer points when we meet you.
The house is a minute away from a lovely park and walking distance from Camberwell, Oval and Brixton.
Applicants MUST have previous childcare experience. We have had previous house mates in the above role should you require a reference from us.
We have a cat!