I think we may be getting a little confused here.
Is there a statute in (I assume British) law, which makes taking a picture or making a recording of a person in a hospital or similar place, a prosecutable offence? I haven't been able to find one, so if anyone knows of such a statute, perhaps they could post a link?
It's often stated that way but as I understand things, the law is that you can be told not to do so and ejected (with no more than reasonable force) if you fail to comply. If you are not challenged, the law is silent on the matter. The owner of the property or their agent cannot confiscate your camera or force you to delete the images. They can only take you to court, privately, to achieve such an intent. Any stronger action means that they have committed an assault or otherwise broken a criminal law.
There are some exceptions to the above, where criminal law comes into the picture. Taking pictures on Ministry of Defence land without permission is definitely a crime and they get very intense on the matter!