Some of the above infomation is completely WRONG:
1. Any Auto is banned in the UK - Correct.
However:
A. A Balisong or "Butterfly" is NOT an Auto.
B. A slip joint is NOT an Auto and CANNOT be classed as one, regardless of how loose the hinge is.
C. An Auto requires some form of mechanical aid to assist the opening process (ie: spring or lever) if it does not have any it is NOT an Auto.