First curve directly behind toilet is a pan connector, then normal bend, straight, knuckle bend at wall (indicated with orange arrow), straight through wall, normal bend on outside to stack.
At back of toilet, current plan is:
a) pan connector, then standard curve - then the straight section
I don't know if it would make any difference, but at the back of the toilet there may be the possibility for:
b) standard curve directly from back of toilet, this then pushfit into another standard bend - then the straight section
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