roguedad,
It is interesting. As a scientist, I was inclined to agree with you - my DCs' high performing comprehensive only offers double at GCSE.
I then did the research alluded to in my posts - a comparison with comprehensives with similar intakes who offered triple, contact with universities etc, as well as significant challenge to the school itself.
The A-level science data indicated no detriment (at a numbers-taking-the-subjects level and, as far as the data was available, grade by grade comparison) in taking A-level individual sciences following double at the double-offering school. the only possible issue was with Physics, in the sense that the numbers taking physics A-level at the double-offering school was slightly lower in the initial years I looked at, but it wasn't borne out by study of further years.
The university / further study destinatons were very similar - ie equivalent numbers from double and triple offering comprehensives with similar intakes were going on to study science subjects at comparable universities.
And, to my surprise, the universities I contacted supported the idea that they treated double from a double taking school as the same as triple from a triple taking school, and had similar proportions of excellent students from both routes.
All this was sightly galling, as i wanted to use data from results and information from universities as a lever to force the school to start offering triple..... but i couldn't collect the persuasive data that i needed....