Imported carton? Luton beer.
The entire description by Tesco indicates this beer has been brewed in Mexico and imported to the UK. Apparently the only bit of this product that might be from Mexico is the cardboard carton. The beer itself is now brewed in Luton, I guess, from reading info given on bottle. The beer itself is no longer of a premium quality - not particularly enjoyable. Tesco needs to correct this false information in their description.