No. It first appeared on English coinage after Henry VIII was awarded the title of "Fidei defensor" by Pope Leo X in 1521.
Henry felt so strongly opinionated about the ideas of Martin Luther and other Reformation thinks that by 1518, while reading Martin Luther's attack on indulgences. he started to write a book in defense of the papacy. This book eventually developed into the "Assertio Septem Sacramentorum" or Defence of the Seven Sacraments, which defended the the supremacy of the Pope (and ironically, the sacramental nature of marriage). In 1521, as a result of this spiriited defense, Pope Leo X awarded Henry the title of "Fidei defensor" a Latin title which translates as "Defender of the Faith" and is still used by English monarchs today.
The letters F:D or sometimes FID:DEF, abbreviated Latin for (FIDEI DEFENSOR) meaning "Defender of the Faith", were left off the 1849 Florin resulting in it being referred to as the "Godless Florin". After the great outcries of righteous indignation, it has been included on all British Coins to date.
The British Shilling has never been made from gold, and has always been made from silver. From 1920 onwards, the Shilling and all other British silver coins, were debased from Sterling silver (92.5%) to 50% silver.
Including the 1986 to 1996 commemorative Two Pound coins, the Royal Mint advises that 377,859,047 British Two Pound coins have been minted up to and including the 2008 issue.
The silver used to make predecimal British coins could have been mined anywhere in the then British Empire. A lot of silver was also acquired from raids on Spanish ships.
This is an incredibly broad question with no real answer. Since British coins have been issued for well over a thousand years, there are numerous rare and expensive coins and really no data to show what is the most expensive of the old British coins.
British gold coins have been minted for over a thousand years. In 1786, the British gold coins in circulation were the Five Guinea, Two Guinea, Guinea and Half-Guinea coins. The Guinea was equal to 21 Shillings.
Any Halfpenny coins circulating in Gibraltar in 1917 would have been British Halfpenny coins.
If they have been circulated, all British "New" Pence coins are worth whatever is indicated on them.
All British circulating "silver" coins since 1947 have been made from a copper/nickel alloy. No circulating British decimal coin contains any precious metal.
The Royal Mint advises that from 1968 to 2010 inclusive, there have been 8,266,445,915 5 Pence coins minted.
British coins have been minted for well over 1,000 years. There are hundreds if not thousands of rare British coins from this period. Other than the odd "error" coin that might turn up from time to time, there are no general circulation decimal coins that could be considered to be especially rare.
Coins have been used for thousands of years. The first British coins that are still currently in circulation are the 1 Penny and 2 Pence coins.
The first coins made in Britain were gold coins struck by the Celts in or around 70 BC. Prior to that, there were imported coins circulating, dating back to about 150 BC.