Police say ten people have called the Claudia Lawrence incident room following the Crimewatch appeal on BBC One.
Another ten people have been in touch following the earlier media coverage, taking the current total to 20 calls.
A series of new appeals for information were featured on the programme, including efforts to identify two vehicles and two men seen near Claudia’s home on Heworth Road, York, at around the time she disappeared in March 2009.
Appeal to trace two men
Detective Superintendent Dai Malyn, head of the North Yorkshire Police’s major crime unit, appealed for help in tracing two men.
The first was seen at about 2.30pm on an unknown day during the week Claudia disappeared. The man is described as white, clean shaven, slim build, 5ft 9in to 5ft 10in tall, aged in his 30s, with very neat dark hair which was brownish and stylishly cut with a fringe.
He was talking on his mobile phone and appeared to be looking for a particular house.
The witness is certain the man called on Claudia’s house. A woman looking like Claudia opened the door and seemed shocked at seeing the man. The witness formed the opinion that they were known to each other and he had surprised her with a visit.
After looking up and down the street, she took hold of the man and led him into the house.
The sighting of the other man could be “hugely significant” Det Supt Malyn said.
He was seen standing outside Claudia’s house between 6.45am and 6.55am on Thursday 19 March 2009, the day she disappeared.
The man is described as white, aged 55 to 65, about 6ft tall with a full head of medium-length grey hair which appeared scruffy and windswept.
He was wearing a matt sandy-coloured “mac style” jacket which came just below the knee.
“We need to identify this man as soon as possible and find out what he was doing outside Claudia’s house,” said Det Supt Malyn.
New CCTV footage
Among the evidence screened for the first time on Wednesday night (March 19) were CCTV footage of a car seen braking on Claudia’s street, Heworth Road, on the morning of her disappearance.
It brakes suddenly, near her home.
Some footage from a bus’s CCTV camera also pictured a white Astra van parked near Claudia’s home on the night she was last heard from. Police want to hear from the drivers or anyone else with information about the cars.
Members of the public have also been urged to go to North Yorkshire Police’s new microsite dedicated to the Claudia Lawrence investigation, which went live at 9.30pm on Wednesday.
The Claudia microsite has been viewed more than 6,600 times so far.
Crimestoppers is offering a £10,000 reward for information which leads to an arrest and conviction. This information can be passed on anonymously.
“The response to Crimewatch and the wider media appeal has been very encouraging. We hope people will continue to support the Claudia Lawrence investigation by looking at the new appeals contained on the microsite,” a North Yorkshire Police spokesman said.
“The investigation team is now taking the necessary time to assess the fresh information and will issue an update in due course.”
If you have any information that could assist the investigation, please contact North Yorkshire Police on 101, select option 1, and pass details to the Force Control Room. Please quote “Claudia Lawrence” when passing on details.
Information can also be passed to Crimestoppers anonymously on 0800 555 111, quoting “Claudia Lawrence, North Yorkshire Police”. Alternatively, fill in an anonymous online form on the Crimestoppers website.