Computer apparatus for educational use; education apparatus connectable to television receivers; education software; educational apparatus; educational materials in the form of computer programmes for teaching languages; educational materials in the form of pre-recorded discs for teaching languages; educational materials in the form of pre-recorded tapes for teaching languages; educational science sets; films bearing recorded educational material; films bearing recorded educational material relating to the culinary arts; interactive educational games for use with television receivers; interactive educational games for use with video apparatus