Sorry to rub you up the wrong way yet again, Ben.Let's hope the "capped" pipe isn't live either. Pretty bad bid of advice.
What I meant to say was that, seeing as the OP had managed to remove the fitting it to take a piccy, the pipe (hopefully) can't have been gushing out gas or water, so popping down to the Plumber's merchant to match up another was a possibility. Surely better than doing without the proper plugs and plastering over. I appreciate that leaving the pipe un-plugged for any length of time is a Bad Idea, and I presume the OP does too.
Should have said "plugged" of course.
C.