You need to apply to set the CCJ aside.
You need to do this by completing form N244:
The Court will set it down for hearing and decide whether to set it aside.
But to do that you need to have a defence.
The rules say:
(1) In any other case, the court may set aside(GL) or vary a judgment entered under Part 12 if –
(a) the defendant has a real prospect of successfully defending the claim; or
(b) it appears to the court that there is some other good reason why –
(i) the judgment should be set aside or varied; or
(ii) the defendant should be allowed to defend the claim.
(2) In considering whether to set aside(GL) or vary a judgment entered under Part 12, the matters to which the court must have regard include whether the person seeking to set aside the judgment made an application to do so promptly.
That should resolve it for you.
Can I clarify anything for you about this today, please?
If you need anything further I am available for a follow up at no extra cost.