"The brightest needed the assisted places because state schools couldn't cater to their needs."
Where, and if, this is true, then the government should make bloody sure that state schools can cater to the needs of our brightest students! There is no reason in the world why comprehensives can't educate bright children.
Much better to make sure that schools can do a good job for all children than send in an expensive rescue helicopter in the form of school fees to educate a random small sample.
The government itself is undermining comprehensive schools' incentive to educate top performers to the full extent of ability because the league tables depend on getting middle performers the crucial Grade C pass. Resource schools so that they can prioritise all ability bands.
Progress 8 and the new Grade 9 have not had a chance to make an impact.
Near me is a school which regularly features in the 11+ threads, it is a London super-selective, and the pass rate is often harder to achieve than the grammars a little further away. This school does have a 'super selective' stream of 70 kids. Everyone else is on distance. It is to all intents and purposes a comp, with the complete and full range of the S London demography.
So, comprehensives can cater for the highest achievers.
Let schools get on with it!