If you decide to use a school that offers lessons on a private track and not a public highway, it can be quite expensive. I looked into it (though this was a few years ago now), and quickly changed my mind when I saw my local place had a horrific hourly rate, easily another 50% on top of 'normal' 17+ lessons.
It all depends on how much you want to start driving I guess. I obviously wasn't that keen cos I changed my mind, but for some, it's a cost-effective option. Just google 'driving lessons 16' and the name of your area and see what comes up. My friend had a few lessons for his 16th birthday with one, they'd set up a track with similar conditions to a quiet street, and he really enjoyed it and passed very soon after his 17th birthday.
Of course, as others have said, if you have your access to land where the landowner gives you permission, get yer mum or dad to teach you. Be prepared for heated arguments. Ahem.