installation of central heating was structural alteration within Housing Act
Appeal noted that line between errors of law which went to jurisdiction [of
higher court] and those within jurisdiction [of original body] was a fine one,
and characterisation would often depend on whether courts wished to intervene.
court below had no jurisdiction to determine this point wrongly as it did’.
and non-jurisdictional errors should be discarded.
or tribunal has any jurisdiction to make an error of law on which the decision
of the case depends’.