bridge wrote:
Does the private school ask for evidence of grammar school offers?
Sounds like you have a devious plan in mind, bridge

I can't speak for all private schools but our closest one uses their own entrance exam as the primary measure of academic ability to shortlist the scholarship candidates for external applicants. Given there is an interview with the headmaster involved later, then I'd assume that mentioning (and presumably proving) a high score in an 11+ elsewhere would be in the interests of the parent. In the same way mentioning (and presumably proving) level 3 attainment at KS1, current teacher assessments, etc., if the child was coming from a state primary.
Where it breaks down for our local private schools, is that they play second fiddle to the state Grammar School so all the high scoring 11+ candidates are unlikely to apply to them anyway. We are not in an area that has many Grammar Schools so it may be different in other parts of the country.