Haven't done it, but it looks interesting and I might enquire further.
On distance courses generally, I did some tutoring with the OU and found that while they suit some people very much, others who thought they would be OK with it really struggled. Mainly, the ones who gave up were those who were too optimistic in their assessment of how much time they would be able to commit to it (quality time, not a half hour here and there when knackered or with kids needing attention), or maybe not disciplined enough to use the time they had.
Also, what was noticeable was how many really appreciated the face-to-face tutorials where they could see how other people were doing and exchange thoughts with them - studying alone is a bit disorienting for some people, they're sometimes not sure if they are doing OK, and often they imagine that everyone else must be doing just fine and they are getting behind. Getting together with other students, even if only occasionally, seemed to be really important for most people. Courses which don't offer this may miss out on an important dimension.
I would have thought that a photography course should be more amenable to online discussion than most courses, which might offset this.
As for the points counting towards a degree, the OU credit transfer page only mentions one of the photography courses offered by OCA, so it might be worth checking this out specifically if it's an important consideration.
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