Ok well a CCJ means you did not reply to an original claim form. From what you have said, this is because of you not being at home for ages. To prevent this in future it is always a good idea to update your address at the DVLA or have any letters forwarded to an address you can access.
So now you will need to "set aside the CCJ". When a CCJ is set aside, it is removed from your credit history.
Setting aside a court judgment is usually only possible if you have a good reason. There’s a fee to set aside a CCJ, and if you apply without a good reason you may end up out of pocket. Setting aside a CCJ cancels the judgment. This doesn’t mean the debt disappears or that court action automatically stops.
If the judgment is set aside, you and the creditor are put back in the position you were both in immediately before the judgment. This means if you have an argument or ‘defence’ against the judgment which you didn’t get a chance to raise when the claim was first issued, you have a second chance to do this.
You will need to complete form N244, https://www.gov.uk/government/publications/form-n244-application-notice explaining why the CCJ should be set aside and return it to the court. There’s a fee of £275 to pay.
You may be able to get a CCJ set aside if the original judgment was made without your response being taken into account. This could happen if the claim form was sent to an old address or if you don’t owe the money: You think the debt had already been paid in full before the judgment was raised.
It is important that you ask for any enforcement action to be stopped or ‘stayed’ until your application is heard. You should include this request on the N244 application form when you apply for the judgment to be set aside.