Possible to get into private secondary from a state primary (London)?

Edith Weston's right to say you need to do your research, but wrong to say Westminster requires Latin. There's an 11+ entry point to Westminster Under, specifically aimed at state school boys and for those whose schools end at 11 rather than 13, and it's your standard 11+ (i.e. maths, English and vr/nvr).

Plenty of children go from primaries to private secondaries, you've only got to the look at the numbers - for example City's 11+ entry is 65% state school. Quite frankly, all the parents at prep schools seem to end up prepping their children outside school (i.e. tutors) anyway.

Prep or state primary, those schools are selective and you lots opt for an easier back-up - most people seem to look to Forest, Northbridge House and Portland Place for that. Or you might find that your experience at a state primary is so positive that you prefer one of the rapidly improving Islington secondaries. We are doing the a couple of the selective privates, but I feel we're more relaxed about it as we're very pleased with the state secondary we put top of our CAF so aren't doing any of the less prestigious schools I've mentioned above. The parents of those at private primaries get in a total tizz about 11+, but if your child has survived and thrived at a state primary (as ours has) then you find yourself much less bothered as you'll know that state schools aren't full of feral monsters who bully violin-playing nerdy kids.

I have read your previous threads and I think you might have to relax over the next few years though - it's a long way off!

DN went to Latymer Upper from a state primary. I'm not sure if he had any supplementary tutoring though.

Yes you can, and many do.

But you need to think in advance about entry points, types of exam and whether you need supplementary tutoring (and when to start it). And bear in mind that requirements (such as Westminster requiring Latin, which seriously reduces the number of state school pupils securing places) might change by the time your DS is approaching entrance.

Westminster starts at 13+ (after CE or the scholarship exam). But you need to pass a pretest at 11+. You can apply to the Under School from 11+ onwards instead, and that might be a better bet if your DS's'so school does not follow the CE syllabus. Or you might want to look for a prep school to move to for those two years anyhow if trying for a range of senior schools. Or even from a bit earlier (if your eventual short list of target schools is heavy on those which have yr6 pretesting).

CLS has different entry points, and those might be easier to do from state school (with or without tutoring).