My children are now older, however i worked as both full and part time crew with 3 kids (my husband is also crew).
As i had no family support i fould the only workable solution for all concerned was a Nanny!
I only ever employed trained experienced British nannys and never had any major problems. in fact many of the girls have become firm family friends.
Yes it is expensive, but your children have the best possible care and its only until they go to school, when you can change to a cheaper option.
Nurseries/childmindres are all well and good ,but what happens when your child has one of the (on average) 6 bugs a child under 5 gets a year, (nurseries dont want a sick child)? Do you want to drag your child out of bed at 5 in the morning to take it to your childminder, before you go off to work a 12 + hour day?
These early years should be enjoyed by all, whether you work or not and a nanny will give all concerned the best possibe chance of that being achieved.
Best of luck !