Some disabled people who should have been shielding did not receive shielding letters (for example blind and visually impaired people) and others received them without understanding why.
Nid oedd rhai pobl anabl a ddylai fod wedi bod yn gwarchod wedi cael llythyrau gwarchod (ee pobl ddall a phobl â nam ar eu golwg) ac roedd eraill yn eu derbyn heb ddeall pam.