Till they tinkered with it, we used to only get five weeks off at Summer (we're in Lancashire), and that was in July. We were back at school only a week or two after the rest of the country broke up (so cheaper Summer holidays before they put the prices up!).
It's only a week less, but we then got two weeks off in September, which seems better looking back at it, although we didn't know any different at the time, so I can't say what's better for the kids.
They brought us into line with the rest of the country a couple of years ago, which resulted in a nine week Summer holiday as the two systems crossed over. Now that's a long holiday!!