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Sand base?? not sure what you have been reading but a sand base isn't suitable.
The cheap and bad job would be to just dig out 50mm lay a membrane and then put 50mm of chippings over that.
The proper way to do it would be to dig out 125mm and install a sub base of compacted hardcore of around 75mm then your 50mm of slate. 100mm sub base would allow it to be converted to paving at a later stage.
Its obviously a lot more costly to dig out and remove with skip hire cost of a few tons of hardcore and compactor hire but will last.
Just membrane and 50mm of slate will sink a bit and you may even get water and mud pumping up through it if the garden was very waterlogged.
follow simon's guidelines and you won't go wrong..