Key legal question
Whether the disability pension should be increased on revision to at least a three-quarter pension.
Extracted holding
No material change in the degree of disability was shown for the relevant period; the existing half pension remained in force.
Extracted reasoning
The lower court's assessment of the medical and vocational evidence was convincing. The complaints merely repeated medical opinions and amounted to inadmissible appellatory criticism, so no legal error or manifestly incorrect fact-finding was established.