The local council tax dept. who 'discovered' I owed them some money from several years ago. I queried whether I owed them the money and asked that records be checked, only to be told that because computerised records had changed three times & they could not supply the information "as it's a different system". Usual threats of bailiffs, court action, etc. When I asked why it took them so long to discover this & request payment I was told "We didn't know where you were living", despite paying council tax via direct debit over the past seven years. The joy is that my mortgage company phoned me last week to state I owed some money from six years ago. WTF....they apologised but are unable to explain how this happened.