www.bbc.co.uk/news/education-26360655
This bbc link suggests that that the term dyslexia is not useful and that instead all non readers should be given intensive help. I think its fair to give all non readers equal help, but a child needs the RIGHT kind of help. There is no one size fits all to solving reading problems.
Is it better to spend the money on expensive diagnosis or one to one tutition. Could the cost of dyslexia diagnosis be brought down by the use of technology to help teachers? Prehaps a dyslexia test could be given to every four year old, just like a hearing test.
I think that finding out why a child has reading difficulties can help teachers develop effective strageries. For example a severely deaf child with reading difficulties needs different strageries to a hearing child with dyslexia or dysteachia.