Nurse Lisa Kieh holds a vial of the Moderna Covid-19 vaccine at a vaccination centre at Ffwrnes Theatre in Llanelli, South Wales, on April 9, 2021. (Photo: AFP)

Britain said late Monday it had met its target to offer by April 15 a coronavirus vaccine first dose to all over-50s, the clinically vulnerable and health and social care workers.

"We have now passed another hugely significant milestone in our vaccine programme by offering jabs to everyone in the nine highest risk groups," Prime Minister Boris Johnson said in a statement.