These past five days in May have seen some fairly oddball goings-on labelled as "New Dance at the Southbank Centre". Accidentally coinciding with other oddball goings-on on the national scene, since it was booked up long ago before elections were called. But no double-act in politics is likely to be quite as peculiar and weirdly stimulating as that between the Spanish cabaret artiste La Ribot (often to be found nude) and the postmodern French choreographer Mathilde Monnier, playing two sides of a woman who can’t help being at war with herself, like slapstick twins or conjoined politicians.