Shaun Ley speaks to Frances O'Grady, whose organisation - the TUC - is the collective voice of the unions. Not since Margaret Thatcher vowed to break the power of organised labour has Britain's trade union movement faced a bigger threat. The new government wants to make it harder to take industrial action, and in most countries across Europe, the number of workers joining unions is in decline. For many of those most in need of support in the workplace, have the unions become irrelevant?