top four in london

See these:

Pure Beauty - John Baldessari at Tate Modern
Authority to Remove - Jill Magid at Tate Modern
Ed Ruscha at the Hayward  
Passing Thoughts and Making Plans - Artists using photography as part of their process (including Rachel Whiteread, Tacita Dean, Cornelia Parker, Richard Wentworth & Sarah Jones) at the Jerwood Space