There are quite a few 'new style' PhDs available now in the sciences where you spend a year doing an interdisciplinary MRes and then go on to do 3 more years of an actual PhD. These are available at a variety of universities, if you type in MRes/PhD into google or try 4 year PhD program you should get some info. The 4 year PhD is becoming more common place now, but these are not always awarded with a master/PhD combo. Just out of interest is there a particular reason you want to get a masters and a PhD at the same time? I am not sure if that is really necessary for the science world.