No legal expert but if the child is with you in England suggest you speak to an English lawyer (solicitor) familiar with international law. Maybe start with Citizens Advice Bureau to discover such a lawyer. Is care & custody of the child part of the divorce agreement? And if so, where was divorce granted i.e. which country? DR or UK?
Dr. Guzman will advise if it was a DR divorce, but if it was elsewhere I think you'll need a lawyer familiar with the law of that country.
If you need it - UK Child Abduction Unit, Official Solicitors Department, 81 Chancery Lane - Fourth floor, London WC2A 1DD
Telephone: 011 [44] (171) 911-7047 or 7094
Fax: 011 [44] (171) 911-7248
Website
Child abduction within the UK - Offices of Court Funds, Official Solicitor and Public Trustee
Specialist solicitors in UK
Referral List of Specialist Solicitors - Offices of Court Funds, Official Solicitor and Public Trustee