One pound (also a "quid" or "nicker") contained twenty shillings (a "bob" in slang). Twelve pence to the shilling. Six pence was a "tanner". There was also a threepenny piece known as a "thrupenny bit". A crown (long obsolete) was five shillings (a "dollar" in slang)but the two shillings and sixpence coin was called half-a crown (or "two and a kick", or "half a dollar" in slang). In my youth we had halfpennies (Ha'pennies) and farthings ( a quarter of a penny). Contrary to scurrious rumours I don't remember the groat (fourpence) or the guinea (One pound and one shilling). The horsey fraternity still trade informally in Guineas, hence the race names. Racing slang has pony, monkey etc for larger sums.
We changed over to decimals in ?1971-ish. I can remember three column cash books giving way to two column ones.
RtS (and the euro to come, no doubt!)