Abstract: In a Teletext transmission system, data is transmitted in digital form during lines in the field blanking period of a composite video signal of a television transmission. On reception, the information is decoded and utilized to provide a display comprising a page having a predetermined number of rows of information in alphanumeric or graphics form. The data is received in blocks comprising information digits and each block has an associated group of address digits so that each block can be directed to an appropriate storage location in a first store, regardless of the order in which the data blocks are transmitted. The contents of the first store can then be transferred in address order into a larger capacity serial store ready for use in generating the display. Thus it is possible for a number of pages of information data to be correctly assembled in serial row order, ready for display generation, in a manner accommodating non-transmitted blank rows.