Data collected on the first rollout of the Covid vaccine justifies the Government's decision to delay the second dose, according to an expert.
Professor Anthony Harnden, of the joint committee on vaccination and immunisation, says those already given the jab are experiencing high levels of protection from their first dose.
And the data, set to be published next week by Public Health England, shows infection rates in those over the age of 80 have fallen in the past month.