Mr Thoburn, who is now using dual measure scales, gathered support from shoppers to hand over a 5, 000-signature petition on the issue to Downing Street.
The Metric Martyrs have hailed the move as a victory for their campaign to clear Mr Thoburn's name, despite the fact it will still be illegal to use imperial-only scales.
In 2001, grocer Steve Thoburn became a cause celebre - if French terms are not inappropriate in this context - after being convicted for using scales showing only imperial weights.
Party leader Jeffrey Titford MEP, who is backing Mr Thoburn, said outside the court on Tuesday that the hearing served to "highlight the way the EU is imposing its will on British culture".