Re: What really bugs me
"Can't they just shove a CCTV camera somewhere that can see the Embassy and leave it at that?"
Fail within a fail. Two coppers hanging around the embassy are replaced by a camera - who is going to deal with the output from this camera??
That's right, a copper (or other payed employee) which negates any savings and, wow, another copper who is required to be very near the embassy anyway in case Assange makes his move.
That's just the most favourable outcome of your 'suggestion'. In order to have favourable odds of capturing him, they'd probably want two police ready in addition to whoever watches the camera screen. Which is, of course, more expensive.
And of course you are assuming that the Met have access to a suitable location for the camera - as they probably haven't they would probably have to pay for that facilitly too. And as you're not very good at thinking these things through I'll point out that if they site the camera in a police vehicle near the door there is no advantage over their current on-site watch - unless they trust a single officer to watch the screen and not get distracted at all over their entire shift.
Or perhaps you think they could just skim a recording later? Could make for an interesting maths question in one of Mr. Gove's new o-levels - if Julian Assange escapes an embassy at half past eleven at night at an average speed of 15 miles an hour, how far away could he be by the time PC Bob Smith finds out at nine o'clock the next day? Show your working out.