Scottish certificates are different again. I have had the certificates of my children and my certificate rejected when a UK birth certificate is asked for. I was even barred from applying for a job because I don't have a "valid UK birth certificate".
I can't afford to go abroad just now but know even if I end up financially better off I don't think I'll be able to take my children abroad on holiday. The child trafficing rules would also requir that I have a letter of permission from their father. My ex would never give me that.