Partners in Crime:

"Maybe I should've hid in the gents instead? Nah, too potentially weird." He thought as he emerged from the closet, with another uncomfortable need to pee bothering him.

The Library:

"Oh, I should've looked for a toilet in this place when I got here.." he thought as he hid his need in his characteristically unnoticeable leg crossing.

The Shadow Proclamation:

"really should've gone in the TARDIS before going to talk to the Judoon", he thought as the legend of his species were brought up when his Earth was missing.