Vaccine may become available in a few weeks. Government estimates it could deliver 1 million per week. So about 3 months just to do the over 70’s (probably longer as others are important too!). I think the 1 million figure is determined by the logistics rather than availability – as more vaccines will become available.
And then to get to 70/80% ‘herd immunity’ is doubtful due to conspiracy theorists, covid deniers and general ignoramuses!
So we will need to live with our current way of life for the next 6 months at least.