http://www.tclayton.demon.co.uk/coins.html is the place that I normally look at for an idea of what UK coins are worth.
I only been in the UK since 1998 so, I don't know alot about the predecimal coins.
I believe that your pre-1968 coins do have silver in them.
The first 5 pence and 10 pence coins were issued in 1968 as far as I know.
5 pence switched to a smaller design in 1990 and in 1992 for the 10 pence.
Hopefully others can be more helpful.
I only been in the UK since 1998 so, I don't know alot about the predecimal coins.
I believe that your pre-1968 coins do have silver in them.
The first 5 pence and 10 pence coins were issued in 1968 as far as I know.
5 pence switched to a smaller design in 1990 and in 1992 for the 10 pence.
Hopefully others can be more helpful.



















