The Attorney General has rejected a call to refer "unduly lenient" jail sentences handed to Chris Huhne and his ex-wife Vicky Pryce.
Tory backbencher David Burrowes had written to Dominic Grieve QC earlier this month questioning the eight month terms for perverting the course of justice.
Mr Huhne's former status as a Cabinet minister and Ms Pryce's as a government economist should have been treated as aggravating factors, he insisted.
However, Mr Grieve has concluded that any challenge is unlikely to succeed.
"Having considered the sentences very carefully, I have decided not to refer them to the Court of Appeal as I do not think the court will increase them.
"The Court of Appeal has set out what 'unduly lenient' means in practice. The power to refer sentences under the regime is an exceptional jurisdiction, to be exercised only when the sentencing judge falls into gross error."
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