Fears are growing for a missing British holidaymaker who vanished during a night out with friends hours after flying to the Algarve on Tuesday.

Greg Monks' worried sister Jillian sounded the alert today, saying the Glaswegian had last been seen in the party resort of Albufeira during a first night out in the sunshine resort and describing his disappearance as 'completely out of character.'

She wrote on an Albufeira expat site: 'My brother has not been since Tuesday evening. If you are currently there and have any information place contact me with any info.'

Alison Meechan Fraser, from Hamilton, South Lanarkshire, subsequently confirmed the 38-year-old had been reported missing and police were looking for him.

She said: 'He was with a group of friends. All the other boys are at the accommodation.