UNSC Resolution 1441 clearly stipulates that all parties involved (this includes the US and Britain) were to honor the borders and sovereignty of Iraq, to allow the inspectors to do their job unhindered, and it does not give any nation or nations authority to take any action whatever, other than these two things.

The US and Britain are in violation of UNSC Resolution 1441 by virtue of the fact that they did not honor the borders and sovereignty of Iraq, and because they interfered with the inspectors ability to do their job when they invaded Iraq.