Wireless receiving licences were introduced on 1 November 1922. The figure for that year is thus not strictly comparable with the following years' data.
From 1946 a combined sound and television receiving licence was required by television viewers and the number of sound-only licences begins to fall. The two figures for each year should be combined for a complete number of licences for radio reception. The wireless receiving licence was abolished on 1 February 1971.