Is it possible to change courses within the same college for 2017? Do you still have to pay the full fees in 2017 having completed a year? This is if my son would prefer not to take the PLC option. Thank you

You would have to speak with someone in the admissions office of the college in question. Each college has its own transfer policy.

You would be charged for the first year of the second course they swap over to if they have completed a full year on another level 8 course.

I wonder if it might be worthwhile contacting DCU and enquiring about transfers in from another course?

Yes, nothing to lose by doing this. Each college has their own regulations in relation to transfers and at least you would have some idea what the situation is for this course.