The Allegri Quartet performs Beethoven's String Quartet No 4 in C minor, Op 18 No 4; Shostakovich's String Quartet No 6 in G, Op 101; and Beethoven's String Quartet No 12 in E flat, Op 127. (Note: at 5pm, a pre-concert talk: with Dr Robert Hanson. St Pancras Room; free.)