Hello!
I did mine starting in 2009. It was funded, so I got roughly the equivalent of minimum wage (it's less money, but you don't pay taxes). I also earned some money doing some teaching once I'd passed my upgrade (the formal review where they change your status from provisional PhD candidate to definite PhD candidate).
I'm sorry, I don't know about the government funding. If you can get that per year, it sounds amazing! If it's to cover the whole time, it doesn't look so brilliant and there might be better things out there.
I think whether or not you can work much around a PhD depends on what you plan to do with the PhD. If you're just doing it to get the actual degree, you should have time. And you will have very flexible hours - maybe not initially (some universities expect you to attend some training early on), but certainly later on. But, if you want to go into (say) academia, you will need to do other things, like publishing and going to conferences, so you will have less time. Annoyingly, you'll also need more money, as sometimes you can get conference funding, but sometimes you can't!
It also depends on whether you have to finish within a time limit. If you have to finish in 3 years (fast), I doubt you could really do much work unless you're superwoman. If you're finishing in 4 years (slower; usually the last year in unfunded, but most people do seem to take 4 years), you could probably do a bit more.
Happy to post more if you want - I'm just not sure what's most useful.