The group of four activists were accused of breaking into the Elbit Systems factory near Bristol.
The director of public prosecutions has told prosecutors in England and Wales to bring charges more quickly.
Police officers are treating the death of Jo Shaw as a homicide.
The PM hosts a summit of leaders from the police, arts and universities, after a spate of attacks against British Jews.
The Reform UK leader says the gift was "purely private" and "wasn't political in any sense at all".