There's a bit more detail in 'A Ghost Hunter's Road Book' (John Harries, 1974), but it doesn't say where he got the story from originally.
“Werewolves, a common feature of ghost stories in Europe, are rare in Britain, but the north of England has two reports. Flixton, on the A1039 west of Filey, North Yorks, has one of these fearsome beasts. Equipped with abnormally large eyes which glow in the dark, and exuding a terrible stench, the animal is supposed to fell nocturnal wayfarers with its tail, which is almost as long as its body. The eyes are crimson and dart fire.
Historical records, including those of Camden, significantly mention that about the year 940 a hostel was built in the village of Flixton to shelter wayfarers in wintertime from attacks by wolves. At that period packs of the animals were not uncommon in the north of the country, and they were regarded with particular loathing because in times of severe weather they scavenged in graveyards. Their cunning in discovering unprotected cattle, their boldness in attacking travellers, and their habit of suddenly descending in large numbers on an area where they had previously been unknown, all helped to give rise to the belief that the animals were not ordinary wolves but human beings who adopted a travesty of wolf shape by night. Their nocturnal exploits were supposed to be organised by a wizard whose innocent appearance enabled him to gather information about cattle, sheep and human wayfarers in taverns and market places.”
Wenna