A broadcast signal receiver comprising: a text data receiver for receiving broadcast text data for display to a user in relation to a user interface; a text-to-speech converter for converting received text data into an audio speech signal, the TTS converter being operable to detect whether a word for conversion is included in a stored list of words for conversion and, if so, to convert that word according to a conversion defined by the stored list; and if not, to convert that word according to a set of conversion rules; a conversion memory storing the list of words for conversion by the TTS converter; an update receiver for receiving additional words and associated conversions for storage in the conversion memory; and a remote commander comprising a user control for operation by the user to indicate an incorrect conversion by the TTS converter: in which the receiver is operable, in response to operation of the user control, to send a message to request the provision of conversion information, the message to request the provision of conversion information being indicative of a conversion problem and indicative of text converted at the time that the user control was operated, the message to request the provision of conversion information being indicative of text converted at the time that the user control was operated comprising one or both of: a number of words converted during a period preceding the time at which the user control was operated; and those words converted during a period preceding the time at which the user control was operated; and the update receiver is operable to receive the additional words and associated conversions as a broadcast update signal or by accessing a conversion repository via an internet connection in response to the message to request the provision of conversion information. a text data receiver for receiving broadcast text data for display to a user in relation to a user interface; a text-to-speech converter for converting received text data into an audio speech signal, the TTS converter being operable to detect whether a word for conversion is included in a stored list of words for conversion and, if so, to convert that word according to a conversion defined by the stored list; and if not, to convert that word according to a set of conversion rules; a conversion memory storing the list of words for conversion by the TTS converter; an update receiver for receiving additional words and associated conversions for storage in the conversion memory; and a remote commander comprising a user control for operation by the user to indicate an incorrect conversion by the TTS converter: in which the receiver is operable, in response to operation of the user control, to send a message to request the provision of conversion information, the message to request the provision of conversion information being indicative of a conversion problem and indicative of text converted at the time that the user control was operated, the message to request the provision of conversion information being indicative of text converted at the time that the user control was operated comprising one or both of: a number of words converted during a period preceding the time at which the user control was operated; and those words converted during a period preceding the time at which the user control was operated; and the update receiver is operable to receive the additional words and associated conversions as a broadcast update signal or by accessing a conversion repository via an internet connection in response to the message to request the provision of conversion information.