The claims of police dishonesty over the so called Plebgate row - that cost a cabinet minister his job - has escalated today.

Its been revealed that senior officers changed the conclusions of an investigation into a meeting between the minister, Andrew Mitchell, and three police federation members. According to the police watchdog - the IPCC - the first draft of a report by West Mercia police found the three did have a case to answer for misconduct. The final version said they did not.

Political Deputy Editor Chris Ship reports:

Earlier today the Prime Minister David Cameron said the former chief whip Andrew Mitchell is "owed an apology" over the incident.

Mr Cameron said the conduct of three officers from the Police Federation was "not acceptable".