They are more senior but in a different region of the English “county court.”
So how does this work?
Yes, if it's a binding precedent.
And it could be the other way round, also. The main difference is that district judges hear the higher value, more complex and/or protracted cases.
Your circuit judge could be a member of the Crown Court, the County Court or a specialized sub-division of the High Court of Justice.
The hierarchy of the courts of England and Wales is:
Court hierarchy England and Wales
The Crown Court and the County Court are the same level so they do not create binding precedent on themselves or each other. If your circuit judge is a member of the High Court then their decisions do bind the County Court.
England and Wales is a unified jurisdiction so it doesn’t matter where the courts are located. There is no such thing as a “circuit split” as can happen in the US Federal system.