plan to build patio....help required


I am planning to remove my existing patio ( flagged ) and replace with new flags. T what extent will i have to prepare the ground?
Will i have to dig down and replace everything with mot 1 hardcore or should i just lay a fresh sharp sand and cement mix ?
any help or tips much appreciated
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have a look here http://www.pavingexpert.com/home.htm its a very informative site
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looked through site but cant find answer, anybody help?

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I can't see any point in digging up and replacing perfectly sound substructure. Having said that, I assume it IS perfectly sound? I mean, it not subsiding and letting the flags crack, is it?
If not, then leave it and lay the new flags instead of the old ones.
Rob Graham
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