have you any childminders in your area? sometimes they are not full on a particular day so may be able to take your children. my nursery does emergency childcare too. it may not be advertised so you need to call them.
I've racked my brain and can't think of any options so I'm hoping someone on here might be able to help. I'm a full time SAHM with 2 DD's 1yr & 2yr. My husband is a contractor and only gets paid for the days he works. Since having DD2 I've had problems with my back and DH is having to take days off to look after the DD's meaning we don't get any income for those days. We have no family nearby and no friends who can help out. We can't keep doing this financially as it's crippling us but we can't find any childcare options that can take the DD's at the last minute and only occasionally. Does such a thing exist?