In our county we have a mixture of 11-16 comprehensives, and 11-18s. There are a smattering of FE colleges for A-Levels but no "Sixth Form Colleges" as such. In the 11-16 schools students leave for various destinations including the Sixth forms at the 11-18 schools.
The county school strategy is for any new school to be 11-16 - it seems to be the model they prefer.
I come from a part of the country where all secondaries are 11-18 so I am not really sure about the pros and cons of 11-16 schools.
The two comprehensives where we have a realistic chance of a place are both 11-16s, so I really need to get my head around this by the time DS1 applies for secondary in 2-3 years.
Thank you :)