Detectives have passed a new file of evidence on the Parliamentary expenses scandal to prosecutors.
Scotland Yard said the new file will be considered by specialist lawyers at the Crown Prosecution Service (CPS).
The dossier was the ninth to be passed to prosecutors, six have resulted in charges and no further action will be brought in two other cases.
A Met spokesman said a “small number” of cases remain under examination by a joint panel of police and prosecutors.
Director of Public Prosecutions Keir Starmer and Metropolitan Police commissioner Sir Paul Stephenson set up a team to consider political expenses cases in May last year.
Members of the unit have charged six people – four MPs and two peers – and decided two people should face no further action.
Former Labour MPs David Chaytor, Elliot Morley and Jim Devine were charged with theft by false accounting earlier this year.
Chaytor faces jail after he pleaded guilty to stealing more than £20,000 at the Old Bailey last Friday.
The remaining two former Labour MPs face trials in the new year after they exhausted appeals against the case.