So after another week of this frustrating issue I believe I've sussed it.
On a random forum in the depths of the internet someone spoke of a similar issue and having Firefox open may be the issue. Whilst I have been running the two side by side since day one I thought I'd give it a go...
Success! For reasons unknown to me I can now save and undo all I want, how nice that the product functions as intended.
Hopefully this will help others, shame no one in the greater community could point me in the right direction.
Sadly, Firefox didn't work...
I have also come to use CC on a separate project and I'm now having the same issue. Now that it's a current product hopefully Adobe will give me the answers I'm after...
Talking to Adobe this is a continuing issue, I was asked to submit a bug report. The only suggestion they had for me was to work from my desktop. I am in a team of 6 working from a server and this is apparently the problem. This is far from an ideal solution, I hope the issue is rectified soon.