Pounds, shillings and pence were the divisions of the currency.

One shilling was made up of 12 pence; one pound of twenty shillings equaled 240 pence.

Pounds were represented by the £ symbol, shillings as "s." and pence as "d." (from the Latin denarius). One pound, one shilling and one pence was written "£1.1.1." One shilling and six pence, which would have been referred to in speech as "one and six" and was written "1/6."

A guinea was a coin valued at £1.1.0. The actual coin was taken out of circulation in 1813, but the term remained and was in use during our time frame. It tended to be reserved for luxury goods, however, rather than for mundane items.

A sovereign was a 20 shilling coin, a half-sovereign was a 10 shilling coin.

A crown was 5 shillings, and half a crown was 2/6.

The remaining coins were the florin (2 shillings), sixpence, a groat (4 pence), a threepenny bit (pronounced thrup'ny), twopence (pronounced tuppence), a penny, a halfpenny (pronounced hayp'ny), a farthing (1/4 of a penny) and a half a farthing (1/8 of a penny).

There is a great website the provides all sorts of information on the Current Value of Old Money. It's pretty interesting.