Well that depends, in criminal cases they mostly deal with all stages of the case. They sentence anybody who pleads guilty..
But what if they plead not guilty?!
Then they are tried until a verdict is found. They have the power to fine people up to £5,000 and companies up to £20,000.They can also send people to prision for 6 months.
Wow, but what do they do in civil cases?
In civil matters they deal with cases like enforcing debts owed to the utilities and granting or refusing alcahol liscences to betting and gaming establuishments.