The thing with collecting coins is that collectors want the best possible examples - and with modern coins that means the need to be uncirculated - meaning that they have never been used, and are in prefect mint condition. read more
They are coins with Elizabeth II, the current Queen of the United Kingdom on the 'heads' side. Since they are still currently in circulation in the UK by the millions their value is exactly what it says on the coin - A Queen Elizabeth II ten pence piece is worth ten whole pence; a fifty pence coin, 50p, etc etc. read more
An Australian 1978 cupro-nickel 50 cent coin (Elizabeth II), uncirculated and in absolute mint condition could fetch up to $6 AUD. There were 25.765 million minted. An Australian 1978 cupro-nickel 50 cent coin (Elizabeth II)(Proof), uncirculated and in absolute mint condition could fetch up to $10 AUD. read more
That is the Welsh 1 pound coin, which is still in circulation and worth 1 pound. While the UK is combined, there are separate coins for England, Scotland, Wales, and the Isle of Man (at least). Scotland also has it's own banknotes. read more