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Is there anything wrong with pouring concrete between the shed and the fence? As an added layer of fuckyou?
ChainBreaker-
0.75 tonnes of concrete might be overkill...
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The mass of the concrete will probably damage both the fnec and the sned side at their lowest edges. The concrete will shrink, leaving a path for rainwater to penetrate down the entire lengths of the timber used for the shed & fence. Even if both are 'treated' timber they will rot in an accelerated timescale, as they will never dry out.
You can discourage unwanted guests by planting a thorny blackberry bush, and training the stems along the top of the fence and shed roof. -
Consider a foot or so of flimsy looking trellis. A thief would be worried about it snapping and stabbing them if they tried to climb over. This also gives you something to train something thorny like blackberry along.
NotThamesWater
mespilus
Ramsaye
I'll have 4x4 skids as there is already a paved area - I'll have a dpc strip over them.
The frames are all tanalised 2x4, with 11mm OSB skin.
Cladding on the front and sides is 21mm shiplapped thermowood, and the rear will either be 18mm marine ply, or reclaimed feather edged fence strips (it's 100mm from a fence, son doesn't need to look pretty).
The frames and skin will be nailed, so I'm not too worried about hiding screw heads.
For security, I'll have no windows, coach bolts through the hinge (which is hidden behind the cladding anyway), a bar lock across the front, and inside a y-anchor in concrete under the shed. The frames will have builders' bands around them too.
As you say, someone can still get in, but they'll take an age.l, and they'll need a wrecking bar and curring tools.
And when they do get in, they will be face to face with a camera...