From the BBC:
Mr Conway was reprimanded by Commons authorities for paying his student son nearly £40,000 to be a researcher.
Scotland Yard said a “lack of systems” for accounting for MPs’ expenses meant it was ruling out an investigation…
The Metropolitan Police has said it could not investigate the affair because Westminster did not have a system to account for MPs’ expenses properly…
Liberal Democrat leader Nick Clegg said: “The public have the right to expect that their money is being properly accounted for.
“The Speaker’s review of expenses must provide the basis for fundamental changes to the system of MPs’ allowances.”
The Met started an investigation after receiving a letter from Duncan Borrowman, who is the prospective Lib Dem candidate for Mr Conway’s Old Bexley and Sidcup seat.
Mr Borrowman, who asked officers to examine whether a fraud had been committed and said he was “disappointed” the inquiry was not pursued further.