work part time and made sure days were not Monday or Friday - thus I get a long weekend and never have to worry about schools being closed on Mondays and fridays.
I make sure I never take my dd out of school in term time and use all my holiday in school holidays as this reduces the need for child care. Then i am left with 6 weeks to cover 7 weeks this year as the shools are having an extra week in the summer. I use a school holiday club that costs £100 per week, they also do the wrap round care for the school term aswell.