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I wondered about this but GNE was never actually on my credit file, plus apparently only the provider you have the service with can do that.
It turns out the only power these debt collection agencies have - like anyone else - is that they can take you to court. They have no other special powers because they're a debt collection agency, just hot air.
IANAL but if they took me to court I think I'd argue that using a debt collection agency to collect a debt that EDF themselves can't collect would undermine the Electricity Act 1989, which sets out Ofgem's duties.
Maybe but they will trash your credit history by claiming you defaulted on a debt.