An intruder alert is blaring, but the Doctor pays little attention to it. After all, technically his arrival is the reason it’s been triggered. The security system must be very sensitive, but all he needs to do is…
A few moments’ work with his sonic screwdriver and the noise cuts off. That’s better; now he can hear himself think.
Soon armed soldiers will be swarming through this office, and he’ll be waiting for them, because he’s here on a matter of some urgency. Since he can’t get hold of the Brigadier on the phone, he’ll have to visit in person.