The Commons Public Administration Committee listed a number of errors in Cabinet Secretary Sir Jeremy Heywood's inquiry into former chief whip Andrew Mitchell's "plebgate" row.
- The committee said it was "surprising" that Sir Jeremy had not been aware of a note of a conversation that the No 10 head of security and the Prime Minister's principal private secretary had with the officer concerned shortly after the incident.
- They said it was "equally surprising" that he did not establish whether a reported leak of the police log was actually true.
- Sir Jeremy should have advised David Cameron to refer the matter to the relevant police authorities so they could resolve any "discrepancies and inconsistencies", they added.
More top news
Figures released by Network Rail and the Samaritans show there have been 33 more deaths on the tracks in the last year.
NHS trusts are denying thousands of women across Britain fertility treatment in a bid to cut costs, a health watchdog has warned.
Overhaul of NHS would include workplace weight-loss schemes with money and shopping voucher prizes.