3. The provisions of the Act which are specified in column 1 of the Schedule to this Order, and described by reference to subject matter in column 2 of that Schedule, shall, in so far as they are not then in force, come into force on 1st April 1991, but, where a particular purpose is specified in relation to any provision in column 3 of that Schedule, that provision shall come into force on that day only for that purpose.