I currently work 30 hours a week term time only (although I do work half of the summer holiday but only tue/wed/thur on those 3 weeks). I usually do 8.30-2.30pm, but have flexible hours so can change if necessary and can work from home to catch up if required.
I also tend to do overtime in December/January and June, working late and some weekends as that is my busy times.
I started off working 18 hours over 3 days (every week) with a child minder doing school pick up for me. I had to swap to 4 days a week (10-2.30) to do the school pick up when the child minder stopped working and I had no other options for school pick up.
It actually worked out well for me, and I could change my day off to be at school events (assemblies, sports day etc) or work it and take time in lieu during the school holidays instead.
My hours have increased over the years as ds has got older and moved schools.
I upped my hours and swapped to term time only when the holiday child care setting he went too closed and ds moved on the secondary school. I still do the school run both ways as school is on the way to work and there is no bus option (we live rurally and it's not our closest school - 40 mins drive to school and a further 20 mins on from there to work).
WTC and CTC make it doable, but I am concious of the fact I will need to significantly up my hours to be in the same place financially once those stop.
I work for a medium sized accountancy company, and they have always been very flexible and have said that as long as the work gets done they generally don't mind when I do the work. I was originally employed by someone who had been a single parent himself and so was sympathetic and understanding to my situation, which I was open about at my interview when they asked why I was looking for a job after being a SAHM for 5 years. This was all before the flexible working hours changes came in. I'm not sure how much easier to is now, but we do have several part time members of staff (both male and female), and it's not necessarily because they have young children either but suits them and the company.