People vaccinated in the EU or US do not need to isolate when coming to the UK from an amber country.
The UK and US blame Iran for the attack in which two people were killed, and have vowed to respond.
Alex Gibson, 22, jumped into the sea near Blackpool's North Pier in the early hours of Friday.
They came after the after the body of a boy, named locally as Logan, was found.
Health Secretary Humza Yousaf says his daughter was twice refused a place at the nursery, which denies any discrimination.