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Thanks John,
The tank is actually quite flat, there are points where it dips and rises but in general no more than 2 or 3mm at any point. It was poured when the house was first built - so it has an 11m diameter on the top, goes down 3.5m and is currently about 3/4 full of water. We use a fair amount being a family of 4 (3 females and me) but the rainfall here is pretty good.
Any dips or rises were taken care of by putting some aluminium angle down first, then attaching the shed sides to the up-right part of the angle. This had the effect of levelling out any bumps without needing to pour concrete.
Silicone helped a bit too...
Here's a shot of the aluminium going down first, you can see the upright part of the angle? That's what the shed was riveted on to. I added more angle the create a box frame first, then put the shed on to that frame.
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