I'm not a childminder but have you heard of the 'Meet the Minder' sessions that Wandsworth Council put on every month ? When you go you learn all about how to look for a good childminder and they give you a list of all those available in your area (including Balham). There are also childminders who have availability who go to the sessions so you can chat to them and potentially meet one you are happy with. http://wandsworth.childrensservicedirec ... ch&id=4342
Hope this helps.