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 Business Secretary Alok Sharma warned that producing a vaccine is a "colossal undertaking" - and said: "We're betting big to maximise the chances of success."     The government today said it is "betting big" in the "colossal" task of finding a coronavirus vaccine - but it could take some time.     Business Secretary Alok Sharma told today's Number 10 briefing that a new Vaccine Task Force will be desperately working on ending the crisis.         The cabinet minister said: "This task force is up and running and aims to ensure that a vaccine is made available to the public as quickly as possible."   But he warned that producing a vaccine is a "colossal undertaking" and there were no guarantees of success.   He said: "We're betting big to maximise the chances of success."   Mr Sharma said: "We cannot put a date on when we will get a vaccine.   "But, we live in a country with a rich history of pio...