Maggie is among the first set of people contacted in advance by the NHS for the jab based on a pre-determined health risk criteria and will include 87-year-old British Indian grandfather of nine Hari Shukla, who will get his first dose at a hospital in Newcastle.
UK environment secretary Michael Gove became the latest Tory MP to announce his intention to challenge Johnson on Sunday.
She stepped down after failing to win over her ministers with a revised strategy over her plans for the UK's withdrawal from the European Union.