You won't get much drop over your 2m with that height ( or the 900mm forthat matter). What is the soil pipe Cast Iron or PVC if its plastic then your best bet is to lower the branch pipe, you can also turn it so it faces accross the window wall at the same time.
Jason the main soil pipe outside is cast iron but the branch is plastic. It already has a turn in it, a piece of pipe stuck onto end which was used to connect into old WC. There is an option we could take the soil pipe outside closer to the new WC and then get a steeper slope on the pipe, joining the soil pipe further down. Only issue is the new pipe will then run above my porch at front of house - not sure if it will look so nice but it will definitely work better.
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