Rules shakeup comes with corporation anticipating controversy over amount of airtime given to BNPThe BBC is tightening up the procedure for dealing with complaints about the allocation of party election broadcasts, with further controversy about airtime given to the British National Party anticipated ahead of next year's general election.Proposed changes to the system include complainants being required to give details and supporting evidence for their objections. Previously, these requirements were not set out as part of a formal process.The BBC Trust has today issued a consultation document about the proposed changes, which will be in place before the impending election - due before June 2010.Following the controversy over BNP leader Nick Griffin's appearance on BBC1's Question Time last month, it ...