Need a Straight Forward System to takle the "So called Rising Damp?"

[Groovejet]

If you go plasterboard then use damp resisting adhesive but dont go mixing anything with it - best for me is to not use plasterboard but, after removing all trim and skirting, hack off to bricks from floor to ? and render with a sand and NH lime render.
Thats the go to solution in damp work nowadays so dont ever use any gypsum plaster for dampwork.
Leave the bricks for a drying out period if possible and then go on to clean brickwork with the sand and lime only render

Ground to eaves pics gives the full elevation picture.
I dont have a an idea of your floor plan or how the neighbours could be affected?
Lack of a membrane under the solid floors is probably a big cause of your damp
The above, thats what works for me but other guys might do it different.

sorry.. its a wooden floor, this was corrected early on, ta

 

[Groovejet]

If you go plasterboard then use damp resisting adhesive but dont go mixing anything with it - best for me is to not use plasterboard but, after removing all trim and skirting, hack off to bricks from floor to ? and render with a sand and NH lime render.
Thats the go to solution in damp work nowadays so dont ever use any gypsum plaster for dampwork.
Leave the bricks for a drying out period if possible and then go on to clean brickwork with the sand and lime only render

Ground to eaves pics gives the full elevation picture.
I dont have a an idea of your floor plan or how the neighbours could be affected?
Lack of a membrane under the solid floors is probably a big cause of your damp
The above, thats what works for me but other guys might do it different.

You say dont mix anything else into damp resisted adhesive? I guess it'll weaken or damage the mix? Have you seen a way to use DAB with additives?