A terminal device for use in a wireless telecommunications network, the terminal device comprising: first receiver circuitry comprising a Global Navigation Satellite System, GNSS, antenna, the first receiver circuitry being configured to receive a first signal from each of one or more signal emitting devices located at respective spatial positions, wherein the signal emitting devices are GNSS satellites; transmitter circuitry configured to transmit a second signal to infrastructure equipment of the wireless telecommunications network; second receiver circuitry configured to receive a third signal from the infrastructure equipment, the third signal being transmitted by the infrastructure equipment in response to the infrastructure equipment receiving the second signal, the third signal comprising assistance information of positioning, the assistance information of positioning being for determining, in combination with the first signal, the spatial position of the terminal device, and the third signal being comprised within a first system information block, SIB; and control circuitry configured to determine a spatial position of the terminal device based on the received first and third signals, wherein the second receiver circuitry is configured to receive information comprised within a second SIB received from the infrastructure equipment prior to transmission of the first SIB; the control circuitry is configured to determine whether the information comprised within the second SIB is sufficient to determine, in combination with the first signal, the spatial position of the terminal device; wherein, when it is determined that the information comprised within the second SIB is not sufficient to determine, in combination with the first signal, the spatial position of the terminal device, the control circuitry is configured to control the transmitter circuitry to transmit the second signal to the infrastructure equipment of the wireless telecommunications network. first receiver circuitry comprising a Global Navigation Satellite System, GNSS, antenna, the first receiver circuitry being configured to receive a first signal from each of one or more signal emitting devices located at respective spatial positions, wherein the signal emitting devices are GNSS satellites; transmitter circuitry configured to transmit a second signal to infrastructure equipment of the wireless telecommunications network; second receiver circuitry configured to receive a third signal from the infrastructure equipment, the third signal being transmitted by the infrastructure equipment in response to the infrastructure equipment receiving the second signal, the third signal comprising assistance information of positioning, the assistance information of positioning being for determining, in combination with the first signal, the spatial position of the terminal device, and the third signal being comprised within a first system information block, SIB; and control circuitry configured to determine a spatial position of the terminal device based on the received first and third signals, wherein the second receiver circuitry is configured to receive information comprised within a second SIB received from the infrastructure equipment prior to transmission of the first SIB; the control circuitry is configured to determine whether the information comprised within the second SIB is sufficient to determine, in combination with the first signal, the spatial position of the terminal device;