Don't panic, you'll be fine. I believe what people do is breastfeed in the morning and in the evenings and a lot of babies manage fine with water and solids during the day. so while you might still want to send in some expressed breast milk it shouldn't be too much. i formula feed and i am with the baby all day but even i have noticed that she drinks much, much less milk during the day now that she has water and finger foods. what's your local authority, by the way?