Trades Union Congress (TUC) General Secretary Frances O'Grady holds a placard as she joins strikers outside St Pancras Hospital in London October 13, 2014. Thousands of health workers in Britain went on strike on Monday to protest against a pay freeze, the first walk out over pay in the country's state-run National Health Service (NHS) for over thirty years. REUTERS/Stefan Wermuth (BRITAIN - Tags: HEALTH POLITICS)