Concern is growing for a man who has not been seen for four days.
Mr Wallace was born in Newcastle and has a northern accent
Kevin Wallace, 43, was last seen by his partner at his home in Meadow Close, Altrincham, on Tuesday morning.
Police say he has been known to visit Hadrian's Wall and some parts of Cumbria in the past. They believe he could have travelled to that area.
Mr Wallace was born in Newcastle and speaks with a northern accent. He is of heavy build and has dark brown hair and blue eyes.
He was wearing black chinos, black shoes, a black and red fine-checked shirt and a watch when he went missing.
Det Con John Graham-Cumming, from Stretford CID, said: "We are getting really worried about Kevin because we haven't heard from him for days now.
"His partner is totally beside herself with worry, and wants him to know that she is here for him no matter what.
"We want Kevin to contact us if he reads this, just so we know he is safe. If you think you can help us at all, please get in touch."