On the GRO site today:
We are currently adding to our online indexes which will help you identify and apply for copies of our records. We have now added online indexes for deaths registered between 1984 to 2019.
We will notify you here when more indexes are added online.
https://www.gro.gov.uk/gro/content/c...ates/login.asp
They still have a gap between 1957 and 1984, but you can search those years on other sites.