The Trust Deed of 28th August 1804 states the doctrinal basis of worship at Coppice:

There are three equal Persons in the Godhead; eternal and personal Election; Original Sin; Particular Redemption by the righteousness of Christ imputed; Efficacious Grace in Regeneration; the final Perseverance of the Saints; the  Resurrection of the Dead; the general Judgment at the last day; the life everlasting to the Saints; and the punishment of the wicked for ever; as also the Ordinance of Believer’s Baptism by immersion; the Lord’s Supper; and the public preaching of the Word of God in the mother tongue agreeable to the aforementioned doctrines and ordinances.

Put more simply, our beliefs can be summarised as:
There is only one true and living God.
God has spoken through His Word, the Bible.
The whole of the Bible is completely true and reliable. It is the only authority for all that we believe and teach.
God is still speaking to people today, by the power of the Holy Spirit, especially as they read the Bible and hear His Word preached.
The gospel is good news for sinful people in a world which has been ruined by sin.
Salvation is through Jesus Christ alone. He is the eternal Son of God who came into the world to save sinners. He lived a perfect, sinless life, suffered and died on the cross, rose again from the dead and ascended up into heaven.
All who are blessed by God with the gift of true repentance for their sins and faith in Jesus Christ have eternal life.
The Lord Jesus will come again, with power and great glory, to judge the world.