Increased maximum sentences for illegal sales
The government said it had created one of the most transparent systems in the world. But campaigners say the legislation was watered down.
Why did they criticise the legislation?
They say the act leaves the government room to manoeuvre on sales to suspect regimes.
For instance, campaigner group Saferworld has warned a side consequence of the so-called "war on terror" is that the UK may relax export controls to countries which are "on side", such as Pakistan.
Campaigners have also said the legislation does little to stop British companies arming both sides in a conflict; in theory both India and Pakistan, thought to be attending the 2003 London arms fair, could buy weaponry and use it against each other.
So can arms companies effectively sell anything they want?
The government says no, but campaigners disagree.
The government is also a signatory to the Treaty banning anti-personnel landmines and has stiff penalties in place against any British company involved in their trade.
But campaigners have reacted angrily to what they believe is a failure to follow through on the law, not least after a BBC investigation found one British salesman offering the weapons.
They also claim that proliferation controls remain weak, meaning a buyer could sell the arms on again to another regime.
But providing a country does not have a poor human rights record, can anyone buy arms?
One of the late amendments forced into the Export Control Act was a sustainable development test.
Many organisations, including the largest aid agencies, say arms sales to developing countries fuel instability and hinder the fight against poverty.
The government's 2001 annual report showed that it granted export licences to 31 of the 41 poorest countries of the world.
One of the most controversial sales was of a £28m BAE Systems military air traffic control system to Tanzania, a deal the World Bank branded a waste of money.
So Labour still faces criticisms over arms?
For many arms trade campaigners it fell at the first hurdle in 1997 and never really got up because it allowed the sale of tanks, water canons and hawk jets to Indonesia.
Since then, ministers have faced questions over sales to other trouble spots including Colombia, Sri Lanka (prior to the peace agreement), Algeria and Zimbabwe's intervention in the Democratic Republic of Congo.