the transcriptions from familysearch are incomplete
for this year, the entries should read
death year, name of deceased, date of birth, registration district and district number, register number, entry number, month of registration
so for Frederick Owen's entry you should get
2006, Frederick Owen, 29MY1921, Liverpool 0251H, reg number: H41D, entry: 274, dor: 05/2006
You will need the entry number before you can order from the GRO.
The registration quarter (created by host sites not the GRO) and register number are not required when you order from the GRO.