Not the first time...
Back when we were prepping ourselves for the invasion of the falkland islands, the MoD lost a laptop then aswell.
This one also contained vital information, THE invasion plans! A massive police search went out looking for the guy that nicked it from the backseat of a car.
The police officer who arrived to question the chap who'd had the laptop on the backseat asked;
"Is there anyone we should notify?"
"Yeah... I think the prime minister should know."