Use of words "pound" and "sterling"
The word pound is used for normal conversation, in the language of economics sterling is used.
Differences between written and spoken ways of expressing amounts of money
The symbol of the pound is written before the number: f70
The letter p which stands for pence is written after the number: 70p
but you say: seventy pounds
and you say: seventy pence or seventy p
Ways of expressing an amount of money consisting of both pounds and pence
If an amount of money consists of both pounds .and pence, then you normally use only the symbol for the pound: f19.99
nineteen pounds ninety-nine pence
nineteen pounds ninety-nine