what on earth happened in London in January 2010? There were stamp duty changes in 2010. So for the right priced house you'd have paid signifcantly less tax on

what on earth happened in London in January 2010? There were stamp duty changes in 2010. So for the right priced house you'd have paid signifcantly less tax on 1/1/2010 than on 31/12/2009. That graph does seem to have a lot of "jumps" though, I'd be interested to know why. It may just be an artifact of how often different areas report?