A dinarius (abbreviation = d) is the basic unit of Romano currency which was referred to in the UK as 'pence' (NOT NEW Pence) which was short for pennies. NEW Pence was a change in UK currency in 1971 that transformed the system of basic monetary unit to NEW Pence (p) of which there are 100p to the decimal Pound. The old unit of penny (pence) was transformed into the new currency by a factor of x2.4 making the old Pound of 240d into a NEW Pound of 100p.
As much as you think it should be
d = dinarius (basic Roman currency unit for almost 2000 years) British currency was based on the Roman 'dinarius' of which there were 240 dinarius (240d) to the pound which consisted of 20 shillings each composed of 12d (12 pennies) to the shilling. A Crown was 5 shillings (5/-) and a halfcrown was 30d (2/6d). A Guinea was 21/- (21 shillings).