happy, latin is a bit niche and has always been know to be a tough option. For what it's worth there's a huge range of difficulty within GCSE. When ds did his (GCSE not iGCSE), his teacher toyed with putting the class in for AS as well as he said there wasn't much difference in difficulty as the GCSE was so tough. Another exam board thought the gcse was so difficult they split in in half and students now get two gcses for the same amount of work.
Schools are very mindful of league tables whatever they may say, so I do think phineys statement was a little naive though it was probably rather unkind of me to say so.
For some views on what teachers think on iGCSE vs GCSE see:
English
community.tes.co.uk/forums/t/637291.aspx?PageIndex=2
"The iGCSE also has a coursework +exam + speaking and lisetning option which is what I have done with my students. The courswork is just that: 3 pieces, 500 - 800 words long, that can be drafted. I entered 70 boys who had all been shafted by the grade boundary shift and would have got C's when we entered them for the AQA exam at the end of year 10 (something we have found really motivating in the past). 69% of them got C's or above (4 got A's and 9 got b's this is higher than they would have got with AQA) in the iGCSE. Tbe courswork allows you to be creative and engage your students in interseting topics/ current affairs. My boys have loved it. "
Maths:
community.tes.co.uk/forums/t/493092.aspx?PageIndex=1
"As go the differences from the standard GCSE there are some differences in topics, the addition of set theory, differentiation of polynomials, function notation (domain, range, inverse etc)...
But as others have commented the questions tend to on the whole be more straightforward in style and have less contextual issues (in part as they are designed to be sat by people whose first language may not be english!)
I personally find the style more closely matches that expected of them when the reach A-level so they find the transition a little easier as not all the topics are new..."