“The court must set aside a judgment entered under Part 12 if judgment was wrongly entered because- (a) in the case of a judgment in default of an acknowledgement of service any of the conditions in rule 12.3(1) … was not satisfied.” (a) in the case of a judgment in default of an acknowledgement of service any of the conditions in rule 12.3(1) … was not satisfied.”
“The claimant may obtain judgment in default of an acknowledgement of service only if- (a) the defendant has not filed an acknowledgement of service or a defence to the claim …; and (b) the relevant time for doing so has expired.” (a) the defendant has not filed an acknowledgement of service or a defence to the claim …; and (b) the relevant time for doing so has expired.”