Pei is not the be all and end all , you want to think about squareness and flatness and all sorts of things during manufacture that may make them cut well or cut badly, also how open the surface of the tile is (pores ) so how susceptible they are to staining ,
Wouldn’t worry about ratings. Get 20 minutes in and you’ll probably have 5mm joints or none at all. Poor for size and quality!
Thanks for the sound advice which I am going to follow.My experience with wickes tiles isn’t great poor quality go to a proper tile distributor
You get what you pay for generally
Thanks for the clarification.Pei numbers are for wear / abrasion resistance not for staining or porosity
My understanding is porcelain doesn't have a pei rating as it substantially outperforms that test