Hi, Thank you for your question and welcome. My name is ***** ***** I will assist you. Yes you can apply to set aside the claim - the threshold for doing this is very low - you just need to show under Civil Procedure Rule 13.3 that you have a real prospect of sucessfully defending the claim - basically that you have a defence. You need to file form N244 at the court where the Judgment came from and say on the form you are applying to have the judgment set aside under CPR 13.3
https://www.justice.gov.uk/courts/procedure-rules/civil/forms - you can find the form here.
Can I assist any further?
Kind regards AJ