Ok thanks everyone for your help :) I only used the butter as in the recipe I was using it said to use a little butter to dissolve any scum that got left behind after skimming. If I re cook to try and dissolve it do I need to bring back to 105c? I found it quite difficult to skim the foam with a spoon, Is there a better way to do it?
I didn't use Pectin and they were big blobs, hard to photograph but definitely visible in both photos. I'm pretty sure it was the foam that I hadn't skimmed off properly...Ah well, I know for next time.