I fail to see how 'many GPs are part time' is relevant here!
The OP is talking about doctors in training, roughly, the average doctor on qualification is in this position anywhere between 5-12 years depending on chosen speciality.
So you leave medschool at 23 and, for up to 12 years, you're on a training pay scale. Those years are when most need a wage which will enable them to rent/get a mortgage, get married, have kids and not to mention, start repaying the huge debts accumulated. In a training post, you will be subject to various professional fees and exams- can be several thousands per year.
I just don't agree that the banding should be cut. It's not ridiculously generous as it stands. God knows how juniors in London survive.
Many consultants and GPs work part time, although 'part time' is probably the equivalent of nearly full time in other professions.
I'm a part time GP having just had a baby and although I work 3 days, this amounts to 36 hours plus having to keep up to date with an additional 3-4 hours of work in my own time each week.
Rewind the clock and ask me to go into GP now? No way! And, without sounding like a complete idiot, I'm a valued, hardworking and popular GP in my practice. It's sad that the govt is driving away those doctors with a real passion for medicine and for those patients we treat. Well done Cameron.