A new government agency has been announced. OfQual is now the official agency dealing with qualifications.
There already have a fairly full website here that can provide information on the way qualifications are structured.
Also featured is the “Exams Doctor” with lots of handy revision hints (done via YouTube clips).
I can’t find anything about specific qualifications (ie DiDA) or about revised criteria for GCSE in ICT but if anyone else can then please add a note.