6. The method as claimed in claim 1 further comprising the steps of: searching for one or more further text strings in the reference image or the digital image of the GUI; and, identifying whether each of the one or more further text strings is a candidate string based on at least one first criteria associated with each said text string.
8. The method as claimed in claim 6 wherein searching for the said text strings comprises searching only within a first search area; the first search area comprising a portion of the digital image of the GUI.