Also, £6M? Bollocks.
A dozen bobbies should be more than enough for a round the clock stakeout. Round it up to 20 just because. Make the generous assumption that the poor low ranks, probationers and others who have pulled this beat get the national average salary of £25Kp/a. In fact let's call it £30K because London. That gives us 30x20= £600K/year, so it should have cost much closer to £1.2M for the two years Assange has been holed up. Even if I've massively underestimated the London salary, you could pay your bobbies £45K/annum and still come in under £1M/year.
If the Met genuinely think they've spunked £6M on this, someone needs to go over their accounting policies asking serious questions.