Student training records.
Looking back through a training record I found this report following an IMC test. There must be many more out there.
...remember, this is was an initial IMC test flight.
...was still unable to establish on the localiser. At one point he became slightly disorientated and entered a spiral dive to the left. He managed to recover only to enter another spiral dive to the right. He eventually managed to get established after zig zagging to full scale deflection. Fail, more practise required.