Here is a little "compare and contrast" chart, plotting the three main UK house price indices; the Halifax, the Nationwide and the government's DCLG index.
The Halifax seems the wildest; it peaks at a higher level than the other two and tends to jump around more. The DCLG is the tracks the Nationwide index closer, at least until the Autumn 2007 peak. After that, the DCLG doesn't seem to pick up the crash.
As I write, I am looking at the Halifax chart and wondering whether it is seasonally adjusted or not. Does that mean I have to do the chart again? Actually, I am feeling a little lazy right now, I promise I will correct it later.