I don't understand why people just refuse to accept Scottish Shorthair as it is. No cat fancy will accept Scottish Shorthair to be registered as British Shorthair. Scottish Shorthair can only be cross with Scottish Fold and nothing else. Your solution is simple all you need is 2 pedigree British Shorthairs to produce kittens that can be register as British Shorthair.

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Manekineko Cattery http://www.geocities.com/hueyleehl/index.html
Breeding pedigree Scottish Fold and British Shorthair