[ The Doctor's just keeping going, giving Mark a little shrug as he continues talking. ]

UNIT's not a law enforcement organization. I thought I'd give you a chance to answer things without cops swarming around—can't be good for business, you know.

[ He seems perfectly calm and perfectly at ease as the Doctor just spews so much bullshit, talking in a way like 'of course this is the truth, why would you think this wasn't the truth?' ]