Andrew Devine's family says the coroner's ruling confirms him as the 97th victim of the 1989 tragedy.
Ministers hope the rule change in England, Scotland and Wales will help reunite family and friends.
Quarantine for fully vaccinated arrivals from US and EU to UK ports also waived.
The BMA doctors' union says it is "scandalous" staff working in the pandemic were put at risk.
The legislation was changed so the monarch's private estates could not be subject to compulsory purchase orders.