Thanks for the responses, after a few email communications, these guys seem fairly legit although I have no idea what it is in relation to. We seem to be in stalemate as they wont confirm what it is about until I confirm "security", i.e. my address etc, and of course I refuse to give them any UK details until I know what they want.
As mentioned to the best of my knowledge I settled all my bills etc on departure. However it concerns me these guys, have my old address in oz. Someone mentioned the debt thing had been done to death, can anyone give an absolute answer as to whether these guys have any authority in the UK or whether they can forward any alleged "debt" to UK collection agents. My other concern if there was a legitimate debt left outstanding, utility bill or something ridiculous, these guys will have inflated the debt out of all proportion with extortionate interest and costs.
From what I can gather 99% of these types of companies operate on the fringes of what is legal and essentially deal in peoples misery and extortion.
