The parents of a Scot who has been missing in Amsterdam for five days have travelled to the city to make an emotional appeal for information on Dutch TV.

Chris Nelson, 24, from Dalkeith in Midlothian, vanished after he left the house of a friend at around 6am on Sunday without a jacket, keys or his passport.

His distressed mother, Donna Nelson, 45, said she had received text messages from her son just an hour before he disappeared without trace and insisted he was not drunk and didn’t use drugs.

Mr Nelson was visiting a friend in the Dutch city with his fiancée, Stefanie Kollross, with whom he lived in Germany.

A tearful Miss Kollross, speaking on local television alongside Mr Nelson’s parents, said: "On Sunday morning my fiancé couldn't fall asleep so what he usually does is he decides to go for a walk, and this is what he did at 6am.

"He left the house without a jacket, his keys or his passport because of course he just wanted to go around the block but he never came back and all of us have been phoning but he doesn't pick up and then it was off.

"He just disappeared. This is totally, totally not him. He's never done this before. My biggest fear is that he doesn't come back or that we never find him."

The couple were staying in the Recht Boomssloot area of Amsterdam and had returned home at 3am after a night out with friends.

After ordering pizza and chatting for a while a “very quiet” Mr Nelson left the flat for a walk at 5.45am in the unfamiliar city, which he had not visited before.

He was wearing a black hooded top, dark jeans and black Nike trainers, police said.

Despite frantic attempts to contact him by friends and family members, Mr Nelson has not picked up or returned any calls made to his mobile, which is switched off.

Mrs Nelson and her husband Scott arrived in the Netherlands on Tuesday and have been searching for information about their son across Amsterdam, including at hospitals and train stations.

Mrs Nelson ruled out the possibility of drink or drugs playing a part in her son’s disappearance and said: “He was very conscious about things like that. I got a text from him about 5am, an hour before he left, and he wasn't drunk.

"He's the most anti-drug guy on the planet. He wouldn't do that.”

The former NHS pharmaceutical technician and bar manager moved to live with his fiancée in the German city of Kaarst, near Dusseldorf, nine months ago and was working as a labourer.

He was said to be homesick, but was due to return to Scotland permanently next month, according to his sister Rebecca Nelson, 22.

“He has the gift of the gab and is just such a beautiful person. He smiles constantly and just makes everybody happy,” she said.

“I can’t describe how much my brother just walked into a room and lit it up. You would meet him for two seconds and fall in love with him.

Dutch police have opened a missing person inquiry and are appealing for anyone with information to come forward.