My friend works for a large private company, she tells me none of the workforce are in a union.She has joined the GMB because she is fed up with the work enviroment and pressure
Will a Union be effective in a place where it is highly likely that she is the only member?
It certainly could be effective in giving her individual support, but unlikely to be any use in changing the Company's ways. A snag of the former is that the Employer has far more ways and means of "dealing with her" than vice versa (since Maggie emasculated the Unions but freed up the Managers).
As generally, the management doesn't have to recognise any union unless a majority of the employees are actually members of a union, then as an individual they'd ahve vvv little effect on the company.