Check their websites,all OCR/Aqa and Edexcel GCE say u can take them in 2017 every unit AS and A2.Check their preliminary timetable for 2017, its on their as resit.On each website it says something like this "The final assessment opportunity (first time entries) for these qualifications (H035, H435) will be summer 2016. Retake arrangements to be confirmed."
Therefore U can do it since this is what they said and its on the 2017 timetable.Its the very last time tho for both AS and A2 i expect.