is it possible to go to a PHD without having a master?

Yes, provided you have the required degree i.e. 2i or above

Yes

Yes, of course. But you must have the right degree class (1st or 2:1). Then again, getting a PhD is competitive, so its also about experience. So in theory if you had a masters, you would have more experience, but there is no harm in you applying with just a bachelors degree. I know lots of people that have started PhDs without masters, then again I know lots of people that have masters. I got a 2:2 so had to get a masters degree, but I also got the project because of previous experience

I've just started a PhD straight from my undergrad but my first year is basically a masters then I transfer into year 2 of the PhD. This is a new rule in my dept - everyone needs to do the masters but it counts as our first year.

Me too. I'm in the same situation as Stu! It also depends on the field you want to work in as some subjects are popular than others. In science alot of people do masters first for various reasons but it does help as it's a very competitve area. However that is not always the case. It just depends on the applicants and who you know.

Depends on your subject area. In social sciences you really have to have a masters.

Yes it is - I've just started a Phd in literature without a masters - if you put forward a strong idea and interview well, then you can gain work on the research skills you already have in your frist year to get yourself up to speed.

I did an HND in commercial horticulture, was registered to do MSc in postharvest technology, but now have intentions to do PhD. It's become quite clear that you dont need MSc, and i will just do enough to get a postgrad certificate!! (Costs a bit of dosh you know!). So no, you def dont need MSc!

I am a recently graduated medical doctor and want to pursue a career in research... does that mean i can jump right in and do a PhD .. or are there some prerequisites?

I have just finished my BA in creative and professional writing and i am hoping to be able to go straight to phd as financially a masters and phd are off limits.

Yes it is possible but it is very competitive! Alot of it depends on who you know and what contacts you have. And of course a certain element of luck. Experience also helps and showing you really want to do as well!