Covid virus, now is the main hindrance of the World in each field of life. Since one year this pandemic ruled the World in a negative manner affecting economy, industry, business house & society at large. This month before Christmas day, though the number of people affected by corona reduced a lot, but Britain told a new story about the same virus. The PM of Britain, Boris Johnson after knowing a new mutation of covid-19 which is 70% more infectious being forced to declare lockdown with restriction over Christmas. According to scientist the new variant named VUI-202012/01 is rapidly affecting the capital of Britain, that is London. Till today due to covid-19 UK lost more than 67thousand people. Again since some days corona virus mutation is rapidly affecting for which lockdown has been declared. As Public Health England’s Susan Hopkins says on December 18th the new strain’s full seriousness has been revealed & the GOVT of Britain handed over the findings to the WHO also on the same day. On 9th December it came to the light that, more than 62% citizen of capital are suffering with this new mutation. In order to fight with corona the PM became forced to go for a lockdown. UK’s chief scientific adviser Pattrick Vallance is with the view that the new variant might have been in other countries also. Looking towards the plight Netherland, Belgium, Argentina, Chile, Columbia, Canada & India stopped flight from Britain. Scientists say, the new strain of covid-19 infect people more rapidly & it contains 23 changes, also many out them associated with alternations in a protein made by the virus. UK health minister Matt Hancock says, the new lockdown measure might stay in place for some times. He also told to keep it under control anyhow until we have the vaccine rolled out. The pity lies with spike protein of the body which can be changed & this is the key, the virus use to unlock the doorway of our body cells. The history of past one years pandemic should not rebound again & as soon as vaccine rolled out the tension of World people & WHO will not be there any more.