Soil pipe from upstairs bathroom into downstairs

[mattcfc2021]

hi, new to the forum today, i had a bathroom installed a couple of years ago upstairs which was a bedroom above what was a downstairs bathroom in a dorma bungalow, the plumber plumbed in the soil pipes from the toilet and shower etc into the existing low level system doenstairs and used a swan neck and made a bit of a mess, now i want to chnage the toilet downstairs and box it in etc , plumbers i have shown seem to be jinxed by it and dont get back to me with a solution, has anyone come accross this situation and could offer any advice, i would like the section hes put into the black pipe all in one so i can neatly box it in or vanity unit, rather thean the ugly pipe sticking out and the waste has to travel upwards really.

 

[ShaunCorbs]

What’s your feeling on removing the plasterboard from the ceiling?

 

[mattcfc2021]

What’s your feeling on removing the plasterboard from the ceiling?

Could be done yeah as I'm getting a plasterer in anyway for the walls

 

[ShaunCorbs]

Another option is to pack the whole wall off /out around 5” then plasterboard over that

 

[Riley]

someone left that with the flexi running downhill then back uphill??? What else has he left wrong