Speaking after Pc Keith Wallis was jailed for 12 months for lying about witnessing the incident, Andrew Mitchell warned "this can happen to anyone."
"After nearly a year and a half my family and I are grateful to the IPCC for their statement issued today," Mr Mitchell said. "We are also very grateful to Channel 4 Dispatches for their role in exposing what happened. This whole sorry affair has been immensely damaging to everyone involved."
He added: "But above all it serves as a warning that if this can happen to a Cabinet Minister it can happen to anyone in Britain today."
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Cloud and outbreaks of rain will ease away eastwards during the morning, clearing the east coast around midday with sunny spells developing.
Police and emergency services are attending the scene.
Rebel-held east remains at risk while the pumping station supplying the western part of the city is once again in operation.