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@Arducius
225mm will be the sawn size, so the planks will be more like 220 after planing. It is nigh on impossible to get planed timber off the shelf at exactly the width you need (regardless of size), but I reckon if you went direct to a local saw mill they'd sort you out. Might not be worth the cost though.
Generally builders merchants won't stock more than 9" boards, as you have found. Again going direct to the saw mill might help but again might not be worth the cost.
Alternatively you could construct your shelves out of two or more smaller boards (this is what I'd do), or just accept that your shelves will only be 225mm deep (before they were planed, this I wouldn't be so happy with).
Do you have a circular saw and a plane? If you do then it's pretty easy to rip the boards down to the width you need and get a good straight edge on them. I'd still put this edge at the back of the shelf because the "factory" edge should be perfect and you'll notice that yours isn't if you're a perfectionist.
Without a circular saw it's still not too hard but the ripping cuts will take a lot longer than cross cutting.