So, I'm sure everyone has seen the news on the autopsy where he had his Hyoid bone broken - it's a horsehoe like bone in your throat. It is slightly more often broken in strangulation than in hangings, and of course being elderly increases the risk of it breaking. So his death has been ruled a suicide.

Ignoring all the conspiratory stuff for a moment, and just sticking to the facts:

Consider this:
The method of hanging in a prison is almost always off a very low position - like a bedpost, toilet, or doorknob in some cases, and they lean into it, using their body weight to suffocate/go unconscious. Generally there is nothing to tie to that could ever result in a drop. Now the hyoid seems quite a bit more suspicious. It can often break in a hanging (something like - 35% of the time), but hangings usually involve some kind of a drop that makes that more likely - except in prison.

Now back to the regularly programmed conspiratory channel, out of all the known suspects, I'd tend to believe royal involvement before any else. They don't tolerate controversy, not even for a minute. Their continued survival is entirely upon public perception in the UK.