Health secretary Jeane Freeman issued a statement to thank all those involved in the rollout of the programme as it reached the milestone on Wednesday.
The target of one million vaccines was initially set by Ms Freeman for the end of January, but was delayed due to supply issues.
Ms Freeman warned a UK-wide drop in supply towards the end of February would cause the rollout to slow, but said the programme was delivering “ahead of expectations”.
She said: “Our aim is to vaccinate as many people as possible with both their first and second doses as quickly as possible, but the speed at which we can do this depends on supply and we expect a dip in supplies UK-wide towards the end of this month.
“We hope to see a significant drop in the…