Conservative MP Robert Halfon said the price of petrol at the pumps has risen by a "huge amount" since 2009.
Speaking to Daybreak he said he warned that petrol price fixing had gone on "a year ago".
He added: "We had a whistleblower approach us, we urged the office of fair trading to do a full investigation, they did a partial Sir Humphry investigation, and we say enough is enough."
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Drivers of the most polluting vehicles will pay the new £10 T-Charge, meaning a daily payment of £21.50 to enter central London.
It is estimated there are 50,000 alcohol-related hospital admissions a year, costing the Welsh NHS £120m annually.
A rather cloudy start for most, with rain spreading eastwards, clearing to brighter skies later in the day.