Bailiffs are chasing a council tax liability that is more than six years old

Any statutory debt, including council tax that is more than six year old becomes unenforceable in a court under section 9 of the Limitation Act 1980.

You can ask the council write off the debt.

However...

There is a rule that requires the authority to follow correct procedures when it applies for a liability order, and if there is evidence the service of the statutory notice or reminder has not been properly effected then the debtor can rely on section 7 of the Interpretation Act 1978 to negate that liability

If the liability relates to a previous address then the template below sent to the billing authority will nullify the liability and stop further enforcement action in one swing, and the debt most probably dies in the process. Adjust the following template to suit your particular circumstances but do not change its legal content.

 

Make a Formal Complaint, the council is enforcing a statute barred debt.