Try your local "Yellow Pages" under coin dealers or Google "Coin Dealers" in Nottingham.
Here is one to start you off.
Collectors World
188 Wollaton Road,
Wollaton,
Nottingham NG8 1HJ
Please note that Coin Dealers are not renowned for their patience and sense of humour. Do not take a jar full of circulated decimal coins for valuation.
The value of this coin is based on circulation condition. Coins in fine condition are valued at $5. Coins in very fine condition are valued at $10. Coins in extremely fine condition are valued at $30. Uncirculated coins are valued at $50.00
You can take your coins to a coin store
There are a variety of websites and locations where one could get American coins valued in the United Kingdom. One example website would be "Liberty Street."
Circulated coins are valued at $3.75-$4.50
Circulated coins are valued at $650.00-$770.00 Mint state coins are $840.00
Bullion and uncirculated coins are currently valued at $23.00. Proof coins are $25.00.
The coins are valued between $50 and $100. They coins are not common and the price can vary depending upon its condition.
These coins are extremely rare and very valuable to collectors. Depending on the denomination, these coins are valued from $2,000 to $15,000.
Circulated coins are valued at $650.00-$770.00 Mint state coins are $840.00
Coins in average circulated condition are valued at 3 to 10 cents. Uncirculated coins can be $15.00 or more.
You need to give more information like date and denomination.
Most are valued at $2 to $42 depending upon the condition of the coin. Some better grade coins can be valued at $18,000.