Calculating driving distance between UK postcodes

Does anyone have a working/example PHP script that calculates driving distances between UK postcodes that they can share? Thanks -- *Terry Ally* Twitter.com/terryally Facebook.com/terryally ~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~ To print or not to print this email is the environmentally-searching question! Which has the highest ecological cost? A sheet of paper or constantly switching on your computer and connecting to the Internet to read your email?