Hardly, all of the Tesco warranty plans exclude what they call 'prestige' cars. Lexus is on their excluded list
Just checked with Tesco, Lexus IS200, 7 years old £339 (standard Cover). Mazda 6MPS (AWD + Turbo), 3 years old £419 (finest cover)
From what I've read the Tesco Finest cover seems to be as comprehensive as any other. What does the lexus one offer that makes it worth paying £200 more for?