One was probably stud, don't know about the other.
The fact that they've just denied removing any walls is the concerning bit.
Surveyor (ironically) might help you?
The main issue is that to check it's been done properly may involve some invasive work and it's freshly decorated (and also who pays).
We had a pretty extensive survey (4 hours or so) but at that point we assumed that building regs certificates would be in place for the walls, etc
@Howard started
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One was probably stud, don't know about the other.
The fact that they've just denied removing any walls is the concerning bit.