It appears to be drawing a long bow to compare a 1923 court decision from the Kings Bench in the UK to the hearing of the Otago Regional Councils plan change 6C - Water.
The 1923 decision gave rise to Lord Chief Justice Hewart’s ruling – ‘that justice should appear to be done’ and that no one can sit in judgment in their own cause. The mere appearance of bias by those sitting in judgment is sufficient to overturn a judicial decision as happened in 1923 where a deputy clerk to the Kings bench was also a member of a firm of solicitors acting in a civil claim before the Justices. An appeal against conviction was upheld on the basis of a perception of bias.