15th Feb 1971 - a 'dark day' indeed !
2.4d = 1p
No more 'Jenny Wrens', 'Joeys', 'tanners', 'bobs', florins', 'half-a-dollar' (half-a-crown) or a 'dollar', no more Guinea's (although horses are sold in Guineas)
The smallest denomination coin I have in my collection is a 1/2 Farthing (1/2880 of a pound)