UBS takes new $10bn subprime hitBy Haig Simonian in Zurich Published: December 10 2007 07:00 UBS, one of the banks most exposed to the US subprime crisis, bit the bullet on Monday with a further $10bn writedown, combined with the issue of SFr13bn ($11.5bn) in new capital to two strategic investors from Asia and the Middle East.The Swiss group also said it would sell treasury shares, previously due