What happens if bailiffs cannot recover the debt? What further action can the creditor take?

Council tax.^[1]

Traffic Contravention Debts.^[2]

Magistrates Court Fines.^[3]

High Court Writs.^[4]

^{[1] See Don't pay council tax bailiffs, what next?
[2] See Ignore a traffic contravention debt bailiff, what happens next?
[3] See You don't pay the court fine, what next?
[4] See Ignoring a High Court Writ, what happens next?}