Looking at current figures from UK Covid dashboard
People vaccinated (over 18s in the main)
Second dose total - 46,341,057
Booster or third dose total - 17,896,864
That means approx 28 million people are still eligible for booster over the next three months, the majority of them eligible now.
The Guardian this morning reports that the target is 500,000 a day, 3.5 million a week. If that target could be achieved, it would take about 8 weeks to give everyone who wants one a booster.
Where you were in the original pecking order will determine when you are likely to be offered a booster under the new guidelines of 3, rather than 6, months