NEW Boris Johnson reveals the new more infectious "Kent" variant also has a higher degree of mortality.

Sir Patrick Vallance says new variant is 30-70% more transmissible than old variant and can affect anybody of any age.

No evidence of increase in mortality of those in hospital with Covid BUT new strain appears more deadly to *all* those who test positive.

For an average man in his 60s, of every 1000 infected with new strain around 10 people will die. For new variant, around 13/14 will die.

But vaccines still work on UK variant.

However, suggestions they *might* be less effective on South African and Brazilian strains. Research being done in labs across world.