Not a lot you can do for that sort of money. Could you not work a few days a week whilst dd1 at school and get a child minder to have dd2 as you can claim uup to 80% of child care costs back on tax credits. Go onto gov dir and use the IR family tax (do I qualify) site to work through different incomes and childcare costs to see who much better off you'll be.
Sorry it's not the best news I was trying to find something myself to do from home as I need £6000.00 a year to cover out going but wasn't able to find anything so went after looking into it found that I was better working Monday to Friday 30 hrs make much more than £6000. needed and tax credits pay 80% of child care. Now pushing employer to pay by child care vouchers (busy bees)as this is a large tax relief you can have £52.00 a week and it only costs you about £43.00 as it comes out before tax and NI. Look into it all.
Thats a good way to go if you have worked in an industry try giving local companies in the same area calls telling them what you do and what hours your looking for thats how I got my new job on the very first call for the hours I required. If not call the agencies my friend does agency work has just landed a job Monday to Friday 10.00-14.00 so she can drop off and collect from school and she's on £11.00 per hour. Good luck job hurting let us now how you get on.