While we all know that our electoral system is not wholly democratic but I'm not sure that the handful of councillors the Tories had for the last four years, no matter how effective, could actually be deemed to have been in charge of the council.
Thought I'd take a screen shot for posterity.

Currently at this link;
http://news.bbc.co.uk/1/hi/uk_politics/election_2010/england/8675886.stm
Labour of course has taken the council from 'No overall control' at the expense of the Lib Dems and Greens.