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David, my experience of slabs and piers tells me that:
1. Those people telling you to separate the pier from the slab are right.
2. Those telling you the key to pier stability is depth are right.
3. Those telling you that the slab only needs to be 100 mm of concrete are right.
I would also encourage to to consider laying your mesh (before you pour the slab) on a base of capped soft drink bottles of the 1 litre kind. That will greatly reduce the thermal mass of the slab without reducing its stability.
Peter
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