Policywonk is about right on the Brighton situation. Results are due out in a few weeks - this is the first lottery year - but apparently, prelim reports are that everyone in the lottery will get one of the two good schools, but only because they are expnding one of the schools by 60 places per year. If not, then the unlucky childrne would have to travel miles away to less 'successful' schools.
Brighton's issue is one of geography, and yes, the policy was done to engineer labour councillor votes in an area which was under threat from the Greens. The parents got what they wanted (access to the good schools, but in a lottery), but voted the Greens in anyway!
The location of schools in Brighton is very random, but it may mean in future that children have to make two journeys each morning and evening (one into town, then out to the school - there are no direct bus routes between schools and no prospect of school transport). Other children will be doing the reverse journey.
It doesn't make sense to me that this should happen. However, while there is such a difference in 'quality' of schools in Brighton, the lottery has been deemed the fairest way.
Obviously, the best idea is to make every neighbourhood school a good one, that people will want to send their child to no matter what the demographic. Hwr, the poorer performing schools have had loads of money chucked at them over the last decade and still the disparities persist. I am not sure that there is a solution at all, but I can see both the morality of the lottery and the lunacy of it