Police are hoping that someone in Helensburgh and Lomond could uncover new information that would reveal where a murdered woman's body was dumped.

Officers say that a TV appeal by Suzanne Pilley's mother and sister last week resulted in more than 20 calls from the public about the case.

Officers have carried out a meticulous - but as yet unsuccessful - search for Suzanne's remains in the Argyll forests since her ex-lover David Gilroy was convicted of her murder in 2010.

Det Supt Stuart Houston said: "I'm very encouraged by the positive response we have had to the appeal we issued last week."

Gilroy drove down Loch Lomondside on his way back to Edinburgh after a long journey to Lochgilphead for a hastily-arranged work appointment.

During his journey to Edinburgh he dumped Suzanne's body at an unknown spot.

Mr Houston said last week: "Whilst David Gilroy continues to maintain he is innocent, the only avenue left open at this time is a new piece of information from a member of the public."

Damage to the suspension, scrape marks on the underside of the car and vegetation attached to the car were all clues of Gilroy's off-road activities near the Rest and Be Thankful.

In last week's TV interview, Suzanne's sister Gail said the family continued to struggle with the fact she had not been found.

She said: "It is hard to think about her because we don't know where she is. The first thought that comes into your head when she is mentioned is 'where are you?'

"It's extremely difficult to not know where she is and to not have laid her to rest."

Suzanne was last seen on CCTV footage on her way to work in the centre of Edinburgh on May 4, 2010, but she never arrived.

Police believe Gilroy lured Suzanne to a basement and killed her.

He then hid the 38-year-old's body in a stairwell before later transferring it to the boot of his car.

The next day Gilroy drove about 130 miles to Lochgilphead for a hastily-arranged work appointment.

Police reconstructed Gilroy's trip to Argyll via CCTV and his mobile phone but there are gaps of several hours on both his outward and return journey.

The gaps are between Lochgilphead and Inveraray, where officers believe he spent time hiding her body.

Mr Houston said police had carried out an extensive number of searches in the Argyll area at the time but were keen to keep the investigation open.

He added: "It is now for us to try to take it forward and appeal to people who may know something or who may have seen something.

"Now is the time to come forward to allow us to obtain some closure for Suzanne's family."