Few would envy Britain's embattled National Health Service (NHS) workers over the past year. One of the world's worst Covid-19 tolls has meant grueling shifts, danger, and workplaces full of grief and trauma.

In his first on-camera interview, Lionel Dyck, the head of private military contractor Dyck Advisory Group, told CNN's David McKenzie that insurgents in northern Mozambique effectively hold the strategic town of Palma after they staged a complex attack last week.