On the subject of the one year post grad option, I feel it only fair to point out that the FEES aren't necessarily cheaper at a good, CDS affiliated venue - in fact, in terms of lump sum payment they are often considerably harder to meet, because, in effect, the balance of the fee has to be paid in one go, rather than spread out across several years. You would probably find that the fees work out at about the same (certainly, the fee for my own one year post grad was as expensive as any equivalent three year). Of course, this was at what was then standard rate, and I suppose what people may mean is that, because a post grad by its very definition is a second degree that *builds* upon the first, it will not, perhaps, be subject to the same legislation; consequently, you will not be charged for it at an equivalent rate. With that said, my own course did cost somewhere in the region of £12,000 in the first instance.
On the other hand, it is more possible to work round commitments in post grad terms - particularly if you are specifically enrolled on a course which allows leeway for the actor to work as they study - most of these courses, it must be said, are not run by the CDS schools - but they are often of high quality, nonetheless, and well respected within the industry (Poor School, Actors' Company etc.). Even on a more standard one year postgrad you can get away with doing additional shift work in order to fund yourself, although it can be intense, inasmuch as the course itself expects a full time commitment. However, there is not, perhaps, the same level of restriction you would find on a three year course, where there is often an assumption that total focus over the course of the three years precludes any kind of outside activity.