I jokingly not really tell my PhD students that doing a PhD will ruin their life! Well, it does and it doesn't. Don't underestimate the sheer hard work of a PhD either full or part-time. It is also physically demanding (something I didn't expect). So you have to really really want to do it more than anything else.
It's not simply more of the same of course work UG or PG study. You are on your own in many ways, and you have to make the map that you then follow to your destination hokey cliches'r'us
But that said, if it's what you really, really want to do, then do it. Really do it!
A fee waiver offer is not to be scorned. With only a 2.1 at BA level, you're unlikely to be competitive in an AHRC studentship competition, so a fee waiver is a significant offer.
I have one PhD student who's part-time as she's in a profession where there can be lots of work for a few months, and then nothing. So she works full-time on the PhD when there's no paid work, and leaves it with a good conscience when there's paid work.
If you are going to a proper university, there will be a PG induction, which should help you get back into the swing of things. There should be some sort of pick& mix research methods training, as thingshave changed immensely in the last 8 years. Getting to your university isn't so important as being able to get to decent libraries and archives. Most History PhDs require intensive archive work, so you'll need to think about how you will manage that. OTOH, if you are doing a topic which is relatively recent say from the 18C then you may find that electronic resources will be available from home. The Gale Cengage British Library Newspaper collection is my godsend, for example. But you need to be going to a university which has the resources to subscribe to that, as that sort of stuff is eye-wateringly expensive.
You should also use your supervisor wisely. They will have a lot else on, so make sure that you make it your responsibility to keep in touch with them. At one place I worked, we were supposed to see our PhD students every fortnight for 60-90 minutes, at another, it's 10 times a year (roughly once a month). I tend to play it by how my supervisees work best although I do drive them I'm tough, but they do good work, and I will work with them if they show willing. I chase, but only once or twice. After that, it's up to them. In Doctoral research, the candidate sets the deadlines. I am trying to train one PhD student out of telling me that he hasn't met my deadline: I just set possible dates for them to submit the next draft to me. If they don't/can't make that deadline, well, that's their issue, not mine. And your supervisor is the person to whom you show your first drafts -- better s/he sees them, than your Examiners! Although, having said that one of my part-time re-entry PhD students, I then got 20,000 words of very bad writing every month. I had to put a stop to that, and get her writing quality, rather than quantity! It's a learning process (for me as much as the candidate).
You will need to develop a productive relationship with a supervisor - or even a joint supervision (this is increasingly the practice). But s/he is not a teacher, nor really even like a university tutor in an undergraduate sense. I travel a lot, and run a large research grant at the moment, so I tend not to sugar the pill re my students' writing: if it's not good enough, I tell them straight. Better I do so, than their examiners, though. On the other hand, I figure that if you can't take that sort of criticism at PhD level, you're probably not cut out to do a PhD. It really isn't for the timid of intellect, I'm afraid. Nor should it be, in my view.
But you will need to have a much more focussed research proposal (my UG history thesis 20,000 words in those days started as the history of the world with the boring bits left out). Here's an edited version of what I send prospective PGRs (Postgraduate Research):
We ask you for a research statement. We generally ask for a statement of around 1,000 words (but 500-750 words would do -- about 2-3 pages). Your statement should focus on your research aims for the degree overall. You might include:
- the gap in the field that you have identified;
how you will develop an original contribution to knowledge in your field the sorts of research questions you'd like to explore through your research;
- the methods by which you'd like to explore the research questions you set out;
- the body of data you will use to answer your research questions;
- what is your current knowledge of relevant archives, or other sorts of access to original source materials?
We don't expect that you'll have definitive answers to any of your themes, questions, or proposals -- but we find that candidates who come to the degree having started to think about their research in this analytical way will do better in this sort of work.