There was never any "EU imposed illegality of Imperial measures", Stanron. Quote from The Guardian, September 2007

The threat to Britain's imperial measures is to be lifted today after a climbdown by the European commission.

The plans to switch over to metric and abandon imperial measures became a cause celebre for Eurosceptics, unhappy about Brussels's intrusion into British life.

Since 1995, goods sold in Europe have had to display metric weights and measurements, but to appease the public outcry in the UK, imperial indications have also been allowed.

That concession to British tradition was due to expire in 2009, when imperial measures were to be finally banished from packaging and market stalls.