Well of all the cheek! Prime Minister David Cameron today gave a speech to the National Assembly of Kuwait and he naturally commented on the demonstrations taking place around the Arab World. http://www.number10.gov.uk/news/speeches-and-transcripts/2011/02/prime-minister%e2%80%99s-speech-to-the-national-assembly-kuwait-60983
In the section headlined "Recent Developments" in the above transcript he describes the events as a "movement of the people" and:

This movement belongs to the frustrated Tunisian fruit seller who can’t take his product to market. And to the students in Cairo who can’t get a fair start, and the millions of Egyptians who live on $2 a day. In short, it belongs to the people who want to make something of their lives, and to have a voice.

So are we now to believe that he is in support of students demonstrating on the streets against a government who are denying them a fair start by e.g. introducing tuition fees of up to £9000. He then adds:

So whenever and wherever violence is used against peaceful demonstrators, we must not hesitate to condemn it.

That was why he was quick to point out unruly student behaviour during the December protests like rattling a Royal but does not explain his reticence to speak out against the violence suffered by protesters like Alfie Meadows http://www.bbc.co.uk/news/uk-england-london-11967098 or for the police kettling tactics. Presumably he feels such demonstrations are only valid in non democratic countries and the citizens of this country should sit quietly every five years until we are kindly called upon to deliver our judgement. Unfortunately democracy is more than just voting and we as a people have the right to express our view, especially when confronted with policies that were not mentioned in the manifesto in the same year as the election took place. It is often mentioned that compromises need to be made as we have a Coalition government and no one won complete control but that makes it all the more important that we express our views as not one of the major parties produced a manifesto that pleased the majority of the public we are left with a government that picks and chooses its policies as it sees fit believing it has carte blanche to do as  it pleases. It is therefore important that we let them know when we are not happy either through petitions or peaceful demonstration and they have a responsibility to listen.