It seems the scottish system has more capacity in it, making it less of a problem in the first place.
There's a big problem with secondary schools hitting in England soon, and London has already got it starting - not enough places for the number of children, and those places not being where the children live.
In our town, there's aparently only enough secondary places for 2/3 of the children currently in state primary schools in Year 4. (I have a DC in year 3 so will hit the second wave of this lack of capacity). There's 2 'comps' and there's 1 girls grammar, but even with those, there's not enough places. They need 1/3 of the kids to either go private, or pass the 11+ and take a place in one of the grammars in another town. (there's no grammar for boys here). And they need all of the children currently being privately educated at primary level to stay private.
Building work is currently going on at one of the comps, this should add some of the capacity needed, but not enough.
Of course, if my DS does pass the 11+ and take a grammar place in the boys school in the next town, as we wouldn't have requested our nearest state school, we won't get free transport - even though the council needs many parents to make this decision to make the lack of places less of a crisis. This does mean there's a financial issue with who takes the boys grammar places, as it's expensive to pay for travel compared to using the local comp schools. (Approximately £60 for child's monthly ticket to the next nearest town) We can afford to not make this a deciding factor for if our DCs do the 11+ or not, but not everyone can and it's very unfair. But that's a whole extra level of shitness!