These coins are still potentially in circulation so, unless they are part of a Proof or uncirculated mint set or are individual Proof or uncirculated coins and in absolute mint condition, they are worth 10 Pence.
A British 1996 cupro-nickel 10 Pence coin (Elizabeth II)(Proof FDC), uncirculated and in absolute mint condition could fetch up to £2 GBP.
A British 1996 10 Pence coin (Elizabeth II)(Proof in silver FDC), uncirculated and in absolute mint condition could fetch up to £15 GBP.
A reputable coin dealer will be able to give a more accurate valuation.
The older large 10 pence coins were demonetized in 1993, but can be exchanged at face value at British banks.
10 pence - nothing more
It's still worth 50 pence.
There was no 1974 British 25 Pence coin minted.
The British 20 Pence coin was first released in 1982.
Such a coin does not exist. The British 50 Pence coin was first issued in 1969.
There was no 1978 British 25 Pence coin minted.
The first British 20 Pence coin was issued in 1982.
The "face value" of a coin is whatever is inscribed on it, hence the term "face value". The face value of a 10 Pence coin is 10 Pence.
There were no British 1975 25 Pence coins issued.
The first British 50 New Pence coin was issued in 1969.
The value of the copper in a 2 Pence coin would be significantly less then 10% of the face value of the coin at the time the coin was minted. Today, it might be a little more, about 0.2 Pence.
Such a coin does not exist. The British 20 Pence coin was first issued in 1985. They are heptagonal, not round.
It is in common circulation and worth 2 British Pence, or about 3 cents US/Canadian. It is a common coin and worth no more than face value.
In 1944, the British used Pounds, Shillings and Pence. The British have never used cents. There has never been a British 10 cent coin and the British 10 Pence coin was first issued in 1968.