Johnson heralds four million being given first dose of vaccine

The video discusses the progress of the vaccination campaign, highlighting that 4 million people have been vaccinated, including more than half of those over 80 and nearly half of care home residents. The focus remains on priority groups, but as more vaccines become available, the plan is to extend vaccinations to other groups.

What percentage of the elderly residents in care homes have been vaccinated?

What does the speaker mean by 'as more vaccine comes on stream'?