...these 2 exhibitions, which close on the 22nd September and 6th October respectively. Although I really liked them, there's no time to write about them at the moment!
http://www.dulwichpicturegallery.org.uk/exhibitions/now_on_show/a_crisis_of_brilliance.aspx
http://www.tate.org.uk/whats-on/tate-liverpool/exhibition/chagall-modern-master