The FTSE 100 has jumped more than 5.5%, adding £82billion to the value of its shares after scientists revealed the ground-breaking new Covid-19 vaccine could be 90% effective.
It marks the market's best day since March, following news from Pfizer that a Covid-19 vaccine trial exceeded experts' expectations.
Pharmaceutical giant Pfizer and biotech firm BioNTech have said their coronavirus vaccine could stop Covid-19 among those without evidence of prior infection.
The results are based on the first interim analysis of Phase 3 of the study, and evaluated 94 confirmed cases of Covid-19 in trial participants.