The VIX is a measurement of volatility in US markets. What about UK markets?
See the FTSE Volatility Index.
You can see the current index on the Bloomberg site (just one place of many to read it): http://www.bloomberg.com/apps/quote?ticker=VFTSE:IND
You can find background info on what brought the index about, and how to read it, here: http://www.euronext.com/news/press_release/press_release-1731-EN.html?docid=543819 FTA: "Market participants consider volatility indices to work like a barometer; a high value translates to a greater degree of underlying index turbulence; a low value is consistent with greater stability."