you actaully have the right once a year to go through the accounts yourself - and even check that your local councillors supplied valid receipts for their expenses!!
At the time of the local authority's annual audit, a local authority must make available to 'any persons interested' all 'books, deeds, contracts, bills, vouchers and receipts' relating to the audit. These must be available for inspection for 15 days, and public notice given by advertising it in local newspapers. This is one of the most powerful access rights on the UK statute books. There is no exemption for commercial confidentiality, indeed, the only information that can be withheld are details about identifiable members of the council's staff. An authority that fails to allow such inspection commits an offence.
from
http://www.yourrights.org.uk/your-rights/chapters/
the-right-to-know/local-government-information/index.shtml