ConneXtra see(http://www.connextra.com)in London. Company founded on XP principles by JohnNolan and PeterMarks with TimMackinnon as XpCoach.
ConneXtra must be one of the longest running XP teams, started May 1999 and still going!
We use TestDrivenDevelopment and MockObjects. Also GoldCards
Oct 2005: Still going! Still XP!