With regards to the swept tee, right or wrong, I think it was there because the waste coming from left to right in the photo is from a shower waste and there is Also a considerable fall between the tee and the soil pipe connection which presumably might help the high flow drainage. The waste on the far/wrong side of the swept tee is from a barely used (once a month) basin in the adjoining room..
You guys will probably tell me it makes no difference right!
I should make clear that I didn't put any of this in! It was already in the huse!
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