You asked
I will be grateful if you would confirm, from your records, how I may obtain a certificate of live birth, if I was born in the United Kingdom, and if I was born on another foreign land.
We said
Thank you for your request. The Office for National Statistics does not hold the requested information. We suggest that you contact the General Register Office or the NHS Health and Social Care Information Centre to see what information they are able to provide.
https://www.gro.gov.uk/gro/content/certificates/
https://www.gov.uk/government/organisations/health-and-social-care-information-centre