How to get around block pushing bug
Many people her have expressed frustration at the bug that causes the doctor to fall into the trap in the cyberman ice level. To get around this bug, place Amy caddy-corner to the nearest "console" to the ice block and directly in its path. Something about this setup causes Amy to be immune to damage. Then simply push one block into her, then to the far (top) wall. Then push the second ice block in the same manner. You should then end up lined up with one of the pressure plates and be able to finish the puzzle.
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Doctor Who: The Mazes of Time, v1.2.1