have a look here, its possible a good portion of pet cats in Scotland already have some wildcat genes (I've already seen a picture of one hybrid that a lass in Dumfries and Galloway took in - unfortunately I can't find the digital picture as it was 20 years ago but he definitely had the broad tail and other attributs of a wildcat and she said he was a good cat and coexisted peacefully with other cats, dogs and humans (but was very protective to the family group and would see off anyone he didn't like the look of!)
https://www.sciencedirect.com/science/article/pii/S0168159125003041?via%3Dihub