The sentence handed to disgraced DJ Dave Lee Travis has been referred to the Attorney General's Office on the grounds that it is "unduly lenient".

The former Radio 1 star walked free from court despite being found guilty of groping a young researcher behind the scenes at The Mrs Merton Show.

He was sentenced to three months in prison suspended for two years by judge Anthony Leonard, QC, at London's Southwark Crown Court on Friday.

A spokesman for the Attorney General's Office said yesterday: "The case has been referred to us under the unduly lenient sentence scheme."

He revealed that four members of the public have contacted the Attorney General's Office to complain about the sentence. A decision on whether to refer the case to the Court of Appeal will be made by October 24.

The trial heard that the former Top Of The Pops presenter got a "weird sexual thrill" when he indecently assaulted the woman, who is now a successful TV personality, in 1995.

He cornered the woman in the corridor of a BBC television studio where she was smoking, and commented on her "poor little lungs" before squeezing her breasts for 10 to 15 seconds.

Travis, who became a household name in the 1970s, was found not guilty on a second indecent assault charge and the jury was discharged after it was unable to agree a verdict on a count of sexual assault. After the trial Travis said he was mortified at being convicted but was relieved that the jury had not believed him to be a sexual predator.

He faced a retrial after jurors failed to reach verdicts on those two charges earlier this year. He was cleared of 12 counts of indecent assault at his original trial in February.

Travis, of Aylesbury, Buckinghamshire, was first arrested in October 2012 under Operation Yewtree, Scotland Yard's investigation into historic sexual abuse in the wake of allegations against Jimmy Savile.