One other piece of advice. Unless you go poured concrete you're going to have to put a little bit of sand (3mm grain) between your paving blocks or bricks or flagstones ... there's a type of sand that's been treated with some chemicals to bond up and seal in contact with water. You don't need very much and it'll add a bit of life to your patio .. and it comes in a couple different colors. One brand is called Techni-Seal I think.
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