Many people don't bother with planning however and it rarely becomes an issue depending on the area, neighbours etc.
A.
65kn concrete
Good God, you went a bit mad there!! 35n would be quite sufficient for this job, also, a layer of A393 mesh would add significantly to the strength of the slab. 65n, fair play, I wouldn't like to be laying into a load of that on a summer's day, or any day for that matter!!
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