Not sure if you've already found someone for this position or if you're still looking for a childminder.
I'm a nanny with 8+years experience (newborn to 16years old, sole charge up to 4 kids at a time) but I'm currently home with my 21month old girl. At the moment I'm looking after another 18months old boy 2 days a week but wanting more work around my little one as I don't want to send her to nursery yet. We live off Lavender Hill, close to Clapham Common, in a little house with a garden. Our home is very clean, child friendly, non smoking and we don't have a pet. If this is something you're interested in please let me know and we can chat further.
Have a lovely weekend.