I'm not quite sure what point you're making here, but on the assumption that you're challenging the idea of curry as a British dish, curry has been evolving in

I'm not quite sure what point you're making here, but on the assumption that you're challenging the idea of curry as a British dish, curry has been evolving in Britain since before the declaration of independence. Indian and colonial Indian are distinct enough cuisines that there are restaurants specializing in each, and even that doesn't do justice to the fact that some UK 'Indian' staples were invented in the UK.