A No 10 source tells me that the Prime Minister understands the military decision yesterday to order the banning of wearing uniforms off base in London in the immediate aftermath of the murder.
But I understand David Cameron thinks the best way to defeat terror to "act normally", so the temporary order has been lifted.
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Some holidaymakers in Tunisia are determined not to be beaten, but it's not goign to be easy to escape the horror of Friday's massacre.
Drink lots of water, stay out of the sun during the middle of the day, and take particular care of vulnerable people.
The 81-year-old has disappeared from his home on the Spanish island on the hottest day of the year so far.