I will be starting a PhD in October but it's unfunded and I, not being a millionaire, will need to work at least 25 hours a week to keep myself in gin and other necessaries, leaving an absolute maximum of 35 hours to study per week. How long do you spend studying per week aand do you include things like conferences and publishing in journals in this time? Should I change my application to part time?

It does depend to a certain degree on the subject of your PhD. I'm doing a Chemistry PhD which works out at 18-20 hours a week on a spectrometer, 3-5 hours a week in the lab, 8-10 hours processing data, 10+ hours a week reading/report writing/presentations, 3-5 hours a week in meetings/seminars. If you don't have lab/practical requirements I could see 35 hours being approximately enough maybe.