1. A radio receiver comprising: an analogue to digital converter for generating a data word representative of a received radio signal; and a gain control stage including signal-sampling circuitry, and a register for storing the data word, the gain control stage being adapted to control a numerical value of the data word by monitoring the value of the data word and, in response, controlling a position of the data word in the register, wherein an amount of gain to be applied is established by the signal-sampling circuitry configured for operating at a sampling rate that is lower than a sampling rate at which the analogue to digital converter is configured and arranged to operate, and by the position of the data word in the register.