thanks for your reply.
yes i also thought it will most probably stay on the system. do you think the authorities would pay the previous address a visit ?
obviously as you said its under another name so someone can pretend he doesnt know and someone else may be responsible for this fraud (the postman

)
but in order to stop debt collectors harassing that address he can just change it and they would go after him at his other address.
also if the amount was around £300 , do you think card companies would be bothered ?