The fastest supercomputer in the UK can make 15.4 trillion calculations per second.

(The supercomputer, the HPCx (What happened to names like Hal?) is planned to cease working in December 2008. After that Hector (That’s more like it!), or the High-End Computing Terascale Resource, will be owned by the Research Councils of the UK and will start operating in 2007. Hopefully they’ll redesign their web site too.)