The UK will offer round-the-clock vaccination as soon as doses are available, Prime Minister Boris Johnson said.
He also refused to rule out further restrictions in England if the level of new infections is not brought under control, amid fears the National Health Service could be overwhelmed.
The government has faced public criticism for the pace of its vaccination program, with calls to make the COVID-19 jab available 24 hours a day.
Johnson has said that as the roll-out is ramped up and more doses become available, mass vaccination centers will operate 24/7.
The government pledged to vaccinate almost 14 million people by mid-February and insists it is on track to do so. It must meet a target of two million vaccinations a week to meet its deadline.
A variety of extra restrictions could still be introduced by the government, including closing places of worship, banning outdoor food markets, making mask-wearing compulsory outdoors or restricting exercising outdoors.