Det Supt Wayne Fox said: “I thank the public for the positive responses and new information received in support of the current phase of the investigation.
Mr Fox did not say what information prompted the latest search – in fishing lakes eight miles from Claudia’s home – more than 12 years after she vanished.
But in March, on the anniversary of her disappearance, he said: “We continue to receive information from a variety of sources.
I noted back in March he said 'New Lines of Enquiry'.. If they had to move away from their original theory the new information received would have come under close investigation before deciding to take that direction.
Some of this can be discounted because of inquiries we’ve already made.
But at other times we receive information, sometimes anonymously, that appears extremely interesting and sparks full new lines of investigation.”
Mirror newspaper
Link
This possibly suggests whoever gave them a tip off did so anonymously. Hopefully, like other posters have said, it's a legitimate tip off and Police have been given enough to deem that it won't be a waste of their time and resources.
The article also states divers were pumping water from the smaller gravel pit/lake, with 3 officers wading around and watching a monitor screen. It also mentions officers are searching the woodland where the red tape sections are.