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Not that im any expert in paving, wouldnt it be a problem if water gets under and freezes?
In my opinion concrete is more suitable for rigid paving in many cases than just using MOT Type 1 (e.g. Rigid on rigid, flexible on flexible. The only issues will be having to raise the final level due to additional material (say 50mm in total if using calibrated Indian stone) and this could compromise the Dpc. You ideally need 2 bricks (150mm) between the Dpc and the paving, there are some ways round this if its slightly less (on many new builds it's often less due to the requirement of wheel chair access. Also if the concretes badly cracked this could cause the cracks to continue into the pointing on the new paving.
So really in some cases it would be ok others not, your have to access this.
agree with gareth. really depends on how sound the concrete is, but if you do it properly its not going to go anywhere