The austerity cuts haven't started yet. They may cause unrest later. They can't cause unrest before it.
reasons for UK problems:
1. Economy is crap.
2. Inequality. Public education is crap. Lower classes are as anti-intellectual as any red state American.
3. Multiculturalism. Between new immigrants and old ones. Young and old. Muslim and non-Muslim. Black and white. Taxpayer class, benefits class. These cultures are totally ghettoised from each other.
4. Rioting is fun. Herd behaviour. Media coverage - monkey see monkey do. Monkey sees little social sanction.
5. Britain is not a democracy. First past the post is the most stable oligarchy for a political class short of dictatorship. 3 parties fight only for a few thousand swing voters.