Friday 21st May 1920

Road-tax discs for obligatory display on windscreens were proposed by the British government. Introduced in January 1921, they cost £1 per bhp and were 5 inches in diameter with a vertical ‘expiry’ cross in the background, shadowed by either of four differing lines to note the year at a distance. Available as an annual (dual-colour) or 3-monthly (differing single colours) tax disc, they expired on either 24 March (spring equinox), 30 June (summer solstice), 30 September (autumn equinox) or 31 December (winter solstice).