The actor Mackenzie Crook has made a public appeal for information about his sister-in-law, who has gone missing in West Sussex. Police have urged people to check their outbuildings for Laurel Aldridge, who has been missing from the Walberton area, near Arundel, since Tuesday. Crook, best known for playing Gareth in The Office, said the family were “obviously really worried”. Sussex police said they were “continuing to be concerned” about Aldridge. The 62-year-old is considered “very vulnerable” and was last seen leaving her home wearing a turquoise fleece, maroon tartan scarf and brown hat, and carrying a grey puffer jacket. She is about 163cm tall (5ft 4in) with grey/blonde highlighted hair and sometimes wears glasses. DS Alan Fenn said: “We would like to thank the public for the information which has been provided to us thus far. Our officers are pursuing multiple lines of inquiry and are determined to find Laurel. “We would be grateful if residents in the Walberton and Slindon areas could check their outbuildings for any sightings of Laurel. Also, anyone who was in the Walberton area on Tuesday morning or has video footage of someone matching Laurel’s description is asked to report it to us. “The family are being supported by a dedicated officer and being updated with the investigation.” Speaking to ITV, Crook said the disappearance of his sister-in-law, who is undergoing chemotherapy, was “very out of character”. The British actor, who is also known for roles in Pirates of the Caribbean, Worzel Gummidge and The Detectorists, said extensive searches were taking place and urged people to look in their back gardens and other places where she may have sought refuge. “She left her house early Tuesday morning and she’s not been seen since,” he said. “That’s in the Walberton area where a lot of people are looking in the local woodlands, along the roads and stuff like that. “I’d really like to appeal to people to go out into their back gardens and have a look in places where she might have taken rest. “She’s been missing out for three nights – we’re entering the fourth one now [so] we’re obviously really worried. If I could appeal to everyone, even if they checked before, check again in likely places where she might have crept in to lay down for the night.” People are asked to report any information to police by calling 101 if it is non-urgent or 999 if it is urgent, quoting serial number 347 of 14/02.