Thanks for your comments, I wanted to answer fast to ensure you were still there but I have been rewriting my ideas so many times that surely you have gone to sleep!
Well, the cause of my indecision is based on the following.
-Supervisor. There's only one person who can supervise me at my current University, he has been great lately but just after I complained I was not receiving a constructive supervision. So, yes, I'm a bit concerned he may go back to his "previous" self. Comparing the level (number and importance of publications) the prospective supervisors at the Open U. are well ahead, but if they are not really helpful it doesn't matter how many publications they have, I would be better off, as some of you have said, with a supervisor that shares my enthusiasm for the topic.
-Cost. AHRB funding will be difficult to secure as my research interests are not considered a priority by them, besides, my current university is not exactly known for their research in that period so, even my supervisor has recognised that the chances of getting funding are almost non-existant. If I get AHRB funding for the Open...I can't relocate. And have a problem with references because I would need to ask my supervisor for a reference to be accepted by another prospective supervisor and with that I can ruin the relationship with the one I already have.
So I guess I'm going part-time. Part time is slightly cheaper in the Open and it has the added advantage that if I work in my research FT, even if I'm paying part-time fees I can submit my thesis as I finish it, even if that is in less than 6 yrs. With my current U. I'm not allowed to submit a thesis in less than 6 yrs, even if I have finished (because I was paying PT). I really don't feel like spending 6-8 yrs of my life in this, 4 if I can manage would be the ideal (I would be rather old to enter into the job market if it takes that long).
Libraries are not an issue as I have easy access to the British library.
Argh!!! should I toss a coin???