Less Than (2): Everything in this space must be less than 2. The answer is 0-0, placed vertically.
A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
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The BBC has apologised and called what happened "a serious mistake", saying Davie has instructed the Executive Complaints Unit (ECU) to "complete a fast-tracked investigation and provide a full response to complainants".