Welcome to the forums Georgina. There may be a solution for this, but I didn't find a region free firmware for this drive over at The Firmware Page.
I'm going to move your thread to the LG dvd drive forum, where you should get more informed answers.
(And if those guys don't hop to it, tell em I'm going to give them a swift kick! Many of them outrank me so that's not really going to happen, but its a good thought)