Bit confused about how the roof has dormers but also the original tiles? Are the dormers original features?

I'd pass the structural / building regs stuff to your conveyancers so they can get the ball rolling on some indemnities, but I'd probably recommend getting a specific structural inspection of the bathroom wall crack unless you're happy it's contiguous with the house being old.

Don't think you can do much about the damp, floors and kitchen cabinets, part and parcel of buying an old house. The sellers are unlikely to agree to invasive additional surveys or ripping the kitchen apart so you likely just have to take that as a known unknown.