I woudn't call Air or Oblivion world renowned for their quality. World renowned for being world's firsts yes, but not for their quality. In fact Air is runowned for its passiveness.
Anyway, I wasn't saying that there isn't good British coasters, just that there's so many that really aren't special.
In my opinion... Rita, Th13teen, Colossus, Saw, Air, the Drayton Coasters as well as coasters at smaller parks such as Flaming Land, Oakwood, Pleasurewood Hills, are all, at best midiocre.
I may just be a tough critic but I want England to get some roller coasters like Nemesis, that are known globally throughout theme park circles and are ranked highly too.