Plaintiff was a bus company that bought out some rivals. The Commission was entitled to hold an investigation into a company if, under the Fair Trading Act, the area concerned was a “substantial part of the United Kingdom”.
The commission investigated Plaintiff, interpreting “substantial” to mean something “more than merely nominal”.
HL held that this was a correct interpretation and therefore there were no grounds for judicial review.
Unclear judgment (B,M&E):
At one point he suggests that if the commission got the meaning broadly right then the courts wouldn’t interfere, suggesting that jurisdiction isn’t hard-edged.
He seemed to say that the court could only overturn the interpretation of the commission if it was not one of a range of acceptable interpretations.