No charges on 'cash for honours'
No-one is to face charges after the 16-month cash-for-honours investigation, the BBC understands.
Four people were arrested - including two of Tony Blair's aides - during inquiries into whether honours were sold and whether a cover-up followed.
Police interviewed 136 people, including ex-Prime Minister Tony Blair and former Tory leader Michael Howard.
All denied wrongdoing, but friends of Mr Blair say the investigation helped weaken his authority.