I think at least part of it is that the camera crew, apparently, had not removed ties and rolled up sleeves, which is part of the NHS protocol for infection control. (If you look at the video, you will notice Cameron has done this, but the crew wasn't briefed properly or something). In addition, they are moving around an entire ward, from bed to bed, which is categorically different from one person coming in to visit a specific patient and could make infection worryingly easy to transmit from patient to patient.
A few of my nursing friends have suggested that part of the surgeon's frustration probably stemmed from the fact that, though it has not actually been shown to help, he and all of his staff must have no ties/sleeves rolled up, and then the rules were not enforced all along the line. And hospital PR clearing an event is one thing, a doctor looking out for his patients' welfare is something else--and trust me, someone is going to hear about the reasons the camera crew wasn't following protocol.