Hello,

On the upper floor, I have tongue and groove 35x120 timber, and now I need more as I have widened the rooms. Where can I find it?

Maybe it would work to lay 34x120 without tongue and groove since it's only 40cm on each side of the room?
 
Under the floor? Assuming you mean the floor. Put a 1mm cardboard or similar on the floor joists and you'll be at the same height.
 
Yes, it is the floor, but not the actual part you walk on, rather the underlay. I guess it's the past version of wood chip flooring.
 
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