This is what the Press Association has on travel restrictions affecting people coming in and out of England:

The national lockdown for people in England prohibits day trips and holidays, as those are not among the specific reasons for leaving home such as attending school or going to the supermarket.

Travelers are not required to return from their trips early.
Airlines are responsible under consumer law to bring travelers home, but flight schedules will be slashed in response to the drop in demand, meaning many people will be forced to change their travel dates.

It is less than two weeks since the government removed the quarantine requirement for people returning from the Spanish islands.

This led to airlines putting on extra flights to cope with the surge in bookings.

The prime minister did not mention travel corridors in his Saturday night press conference, meaning people arriving from some areas are likely to continue being exempt from quarantine.
But the lockdown means the number of travelers will be diminished anyway.

If your flight is still going ahead and nothing has changed in your destination, you are not automatically entitled to a refund.
But many aircraft are likely to be grounded from Thursday due to the new restrictions, meaning people with existing bookings will be a refund.

UK consumers are protected under European laws which state that they should receive full cash refunds within seven days for canceled flights and 14 days for package holidays that do not take place.

But since the coronavirus outbreak, many people have faced difficulties obtaining payouts from airlines and holiday firms.
That situation is likely to continue over the coming weeks.