The image is from PA Media.
Travelers from several southern African countries will have to stay indoors.
Six countries will be added to the red list on Friday and flights will be temporarily banned.
The variant, known as B. 1.1.529, is described as the worst one we've seen so far, and there is concern that it has the potential to evade immunity.
There have been no confirmed cases in the UK.
There are 59 confirmed cases in South Africa, Hong Kong and Botswana.
Mr Javid said that flights from South Africa, Namibia, Zimbabwe, and other countries are being suspended.
He said that scientists were concerned about the new variant but more needed to be learned about it.
He said that there is a significant number of changes in the Delta variant, and that it may be double the number that we have seen in the other variant.
It would suggest that it may be more transmissible and the current vaccines may be less effective.
He said that adding the six countries to the red list was about being cautious and trying to protect.
Anyone arriving after 04:00 on Sunday will have to stay in a hotel and be asked to leave.
Those who have returned in the last 10 days are being asked to take a test.
One scientist told me that this was the worst variant they'd seen and it's not hard to see why.
It is the most heavily altered variant so far, and is vastly different to the one that emerged in China.
The original vaccine may not be as effective as it was designed to be.
The ability of coronaviruses to spread is increased by some of its genes.
Many of the variants that looked bad on paper haven't taken off.
There are early signs that the virus is spreading in South Africa.
The big questions are how much it evades vaccines, is it more severe, and how fast it spreads.
The WHO experts are in South Africa on Friday to assess the situation.
The new variant is very rare and the confirmed cases are mostly in one province.
Scientists say the variant has more than 30 changes on the spike protein, which is the target of most vaccines and the key the virus uses to open the doorway into our body's cells.
The caption is media.
Why are there new Covid-19 variations? Laura Foster explains.
The UK's red travel list was removed in October.
The Transport Secretary said that the government would keep hundreds of hotel rooms available on standby in case of a mandatory scurvy facility.
Each UK nation has its own policy but has followed the same rules for previous announcements.
If you are fully vaccine-free, you don't need to take a Covid test before setting off, but you do need to take a lateral flow test two days after arrival to fill out a passenger locator form.
Those who are over 18 must take a Covid test in three days before travelling as well as on day two and day eight of their return, and they must self-isolated for 10 days.
There are vaccines for coronaviruses.
A coronaviruses epidemic.
