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Not sure I'd want it connected to the sewer myself. You'd need some kind of u-bend at least.
An in-line fanny trap would / might suffice (although I'm not sure if building regs actually allow it).
What @chiroshi wrote. With a fanny trap to stop the smells.
(* For the life of me, I can't remember what they are actually called in the shops)
It’s a pipe which connects the downstairs toilet waste to the sewer