Optimum time to book a holiday?

[Type R Tom]

I’m looking to book a week holiday around the 8th September, once the schools have gone back and the Olympics are over for me and the g/f. I’ve heard people mention that last minute isn’t always best and you can get better deals weeks before. We don’t care where we go as longs as it’s hot and I keep an eye on travel zoo etc for deals.

So my question is; does anyone who when the optimum time to book a holiday is?