Henrik Thomsen, the Danish cardiologist being sued in London by GE Healthcare, is to countersue the drug firm. Thomsen had claimed that a GE product, Omniscan, caused debilitating side-effects. GE Healthcare responded by issuing a press release which called Thomsen a liar. Thomsen’s lawyer, Andrew Stephenson of Carter-Ruck, said his client is “angry”. GE Healthcare has said it will “vigorously defend” any counterclaim.