Public Health England pleads for travellers on flight LX318 from Sao Paulo to Heathrow, via Zurich, to get in touch.
Former prime minister said government made "mistake" of focusing on influenza rather than respiratory illnesses.
Health secretary Matt Hancock says the Public Health England study is "seriously encouraging".
Boris Johnson boasts Britain has "one of the toughest border regimes anywhere in the world." So what do we know about what went wrong?
Labour accuse government of "unforgivable incompetence" as health officials hunt for Brazil variant Covid case in the UK.
A simple guide to the new variant of concern – and the hunt for an infected person lost in the system.
I am so very grateful to be alive, but eight weeks after receiving the positive test, I still don’t feel completely recovered.
Vaccines minister Nadhim Zahawi said the government doesn't know whether the person contracted the virus in the UK or abroad.
The new strain may spread more rapidly and respond less well to existing vaccines.
Matt Hancock said it is a “magnificent achievement for the country”.