Yea sashh is describing (loosely doesn't even apply throughout England) the English system of education.
As waxon says scots can stay at school post 16, work, apprenticeship or college. When I was posting about dd leaving school last year the number of ENGLISH mners insisting I was wrong and she "couldn't" be leaving school at 16 drove me nuts! Even though I was clear iirc in the very first post that we were in Scotland!
Dd is now 17 and has completed her apprenticeship and is now a full time employee. Something I STILL sometimes get told isn't possible.
She also was studying ahead of the regular schedule so has a few qualifications that would normally be studied in school after 16, but she was very good in those subjects so was able to do this. So when she left school last year one option she had was university or higher level courses at college - again English mners were insistent this wasn't possible.
It's not GCSEs and a-levels here, but nats (national certificate, used to be standard grade) and highers also now advanced highers.
I've also seen posts by other scots mners about their child leaving school before 18, going to uni before 18 etc where English mners have responded - quite insistently - that this is not possible.
It's seriously both ignorant and arrogant!
Also tends to be 4 year (honours) degrees that are undertaken here. Though I think you can do a 3 year (ordinary) degree if you wish - but I don't think they're considered particularly useful and for any careers or postgrad courses that require a degree they generally mean a 4 year honours degree.
Iiuc the education system in NI is similar to Scotland but I wouldn't presume to advise on it as I am not familiar with it, but English mners I have seen do it on NI education posts too.
And yes I know naemnalt (not all English mners are like that) but you do see it a lot.
More appropriate for this thread is the fact certain mners also can't seem to get their heads round the fact that not all mners are British or even living in uk. Another thread I'm on at the moment the op mentioned an armed policemen and some bright spark took that to mean they were lying!
"I'm dreading going to the UK next week and begging Dh that we pack coffee" 
Why? We're nearer to Italy than USA, and we have "fresh" coffee here too, also filter coffee makers, cafetière (it's what I use I think Americans call this French press?), stove top coffee pots etc. Very easy to get good ground coffee here in most supermarkets or even specialty shops if you're very fussy.
I get Italian roast for the cafetière and douwe egberts is the instant I have. Not cheap but I don't have it often as I'm generally caffeine free, just occasionally I fancy it or for certain friends who come over.