Thanks for your patience.
Whilst you may have the judgment registered in the UK, it is perhaps a simpler process to either ask for the CMS to review the decision made via their complaints procedure or commence a new application by asking the court to make an order in relation to maintenance instead of going through CMS.
Complaint re CMS
The benefit to this is that you will get a more senior person to review the amount that they have asked Dad to pay.
If you want to complain in writing our address is: Child Maintenance Service PO Box 249 MITCHELDEAN GL17 1AJ
If you’ve been through all the complaints stages, received a final response and still aren’t satisfied, you can ask the Independent Case Examiner to look at your complaint. You must contact them within 6 months of getting our final response and send them a copy of it.
Please see below details:
By phone: 0800(###) ###-####By text phone:###-##-#######) ###-####By email:***@******.*** By letter: The Independent Case Examiner PO Box 209 Bootle L20 7WA
The Independent Case Examiner is usually a Solicitor.
I would recommend that you follow the above process prior to making an application to court.
The court would not order for him to make a lump sum payment. It would ordinarily be a monthly payment to assist with the continued care of your child. The maintenance ought to be based on his entire salary and not just what is taxable in the UK. The fact that the initial assessment was based on his UK taxable salary this may be a basis for making the complaint.
I would say do the complaint and have the original order reviewed instead of simply sticking with it.