We worked throughout the summer although the pace varied. The CDs from this site arrived in the summer and made working in the heat fun again, also allowed us to focus on weak areas.
We did have a break the first week back at school in September, not planned it just happened. You can only push so hard.
In our area we had to plan for VR/NVR/Maths/English/Essay so we could not risk losing the momentum over the summer. After the eleven plus we had a short break and started gently on SATs, work can become enjoyable once the routine is established.
It varies for each child/parent, do what you feel is right, you can lead a horse to water but you can not make it drink.