A terminal device for use in a wireless telecommunications network, the terminal device comprising wireless communications receiver circuitry configured to receive signals from an infrastructure equipment via a wireless access interface provided by the infrastructure equipment, position detection receiver circuitry configured to receive a radio signal from one or more position detection signal emitting devices from which radio signal measurements can be made to assist in determining a position of the terminal device, and controller circuitry configured to control the wireless communications receiver circuitry to detect position assistance information transmitted from the infrastructure equipment which can be used to estimate in combination with the measurement of the radio signal, received from the one or more position detection signal emitting devices, the position of the terminal device, wherein the controller circuitry is configured with the receiver circuitry to detect a failure in communicating the position assistance information, and in response to detecting the failure in communicating the position assistance information to perform a position assistance information failure procedure, the controller circuitry is configured to control a transmitter circuitry to transmit a message via the wireless access interface to the infrastructure equipment of the wireless communications network indicating that there has been a failure in communicating the position assistance information as part of the position assistance information recovery procedure, and the controller circuitry is configured to adapt one or more communications parameters in order to recover the position assistance information received from the infrastructure equipment. wireless communications receiver circuitry configured to receive signals from an infrastructure equipment via a wireless access interface provided by the infrastructure equipment, position detection receiver circuitry configured to receive a radio signal from one or more position detection signal emitting devices from which radio signal measurements can be made to assist in determining a position of the terminal device, and controller circuitry configured to control the wireless communications receiver circuitry to detect position assistance information transmitted from the infrastructure equipment which can be used to estimate in combination with the measurement of the radio signal, received from the one or more position detection signal emitting devices, the position of the terminal device, wherein the controller circuitry is configured with the receiver circuitry to detect a failure in communicating the position assistance information, and in response to detecting the failure in communicating the position assistance information to perform a position assistance information failure procedure, the controller circuitry is configured to control a transmitter circuitry to transmit a message via the wireless access interface to the infrastructure equipment of the wireless communications network indicating that there has been a failure in communicating the position assistance information as part of the position assistance information recovery procedure, and the controller circuitry is configured to adapt one or more communications parameters in order to recover the position assistance information received from the infrastructure equipment.