We had problems this time around, as DD started reception school, we had to get involved with Citizens Advice, and luckily because our daughter is still only 4, she is legally allowed as much time off school, until the age of 5 then by law we have to authorise any trips, but it was a long battle, and now she is allowed to go on our 4weeks trip this month, I know its along time to miss, as we didnt realise the hols only start now in late july at her school, so she will miss 4weeks of schooling then 6weeks school holidays, but she is still only 4 and we are taking a school pack with us for her to do on holiday, I think though next time around we wont be taking her out, for more than 2weeks, as its caused so much hassle and shes only 4!
(P,s the rule is if your children are under the age of 5 they are legally not supposed to be at school, and although you do need to inform school they are going on holiday or taking time off, you wont need to go through all the channels of being fined, but if they are over 5 you are liable to be fined, we was lucky).