All applicants are required to show hard copy certificates as proof of eligibility during the application process. If you are having trouble locating these documents, it is your responsibility to begin the process of ordering replacements from the relevant exam board before you submit your application for the programme.
Please consult the .gov website if you require guidance on how to obtain replacement GCSE certificates: https://www.gov.uk/replacement-exam-certificate
OCR - Replacement certificates
Pearson Edexcel - Certificate services
If your exam board no longer exists, please visit this government website for guidance.