This cartoon by Adams from The Daily Telegraph uses the title of a novel by Charles Dickens (A Tale of Two Cities) to highlight the contrasting fortunes of protesters in London and various Arab countries (in Dickens' novel the two cities were London and Paris).
On the left, we can see a masked and hooded protester in Trafalgar Square, London. He's holding a can of spray paint in one hand and a placard with the words GOV'T OUT (Government Out) in the other. Clearly a reference to the riots in London last Saturday. On the right, a protester, whose placard bears exactly the same slogan, lies in a pool of blood, having been shot—we can assume—by government forces or supporters. This could be any of the places where popular protests have been met with bloody repression (Libya, Yemen, Bahrein, Syria, ...).
The cartoonist seems to be making the point that while activists/anarchists in Britain can spray slogans and damage public property more or less with impunity, in the Middle East even a peaceful protest can cost you your life. So, while things are not perfect in the UK, at least people are free to protest without fear of getting a bullet in their back.
