All 30 Britons killed in the Tunisian beach attack have been identified, Foreign Secretary Philip Hammond has said.
It came as the bodies of more victims were flown back to Britain, nearly a week after Seifeddine Rezgui opened fire in the resort of Sousse.
Tunisian authorities have arrested a number of people suspected of having links to the massacre.
A "very realistic" mock terrorist firearms attack is being staged in London today and tomorrow to test the emergency services' response.
The exercise has been in the planning since January and will involve a number of locations, the Metropolitan Police said.
Deputy assistant commissioner and director of the exercise Maxine de Brunner said the Charlie Hebdo attack in Paris and the hostage-taking siege in Sydney had an "influence" on the test.
The Met said the test was in no way connected or prompted by the massacre in Tunisia last week.
More than a thousand officers from the Met will participate, but policing levels across London will remain unaffected by the exercise.
Some activity will be "highly visible and audible" to the public, as elements will be "noisy," the Met said.
Stories continue to emerge of the heroism and compassion of Tunisians who tried to help in the wake of the Sousse attack.
Seifeddine Rezgui was halfway through a Masters degree and took exams at the Institute for Applied Science and Technology before the attack.
As details of the dead continue to surface, James Jordan met Mohamed Sabhi, who ran towards the carnage to shepherd tourists to safety.