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These are nothing to do with the enforcement of fines and debts. It is to allow a utility company warrant officer access to services in a property on application to a magistrate to lawfully break entry.
It is normally used when contact with the occupants has been unsuccessful and a utility service remains unpaid. A warrant of entry is used to either disconnect services or fit a pre-payment meter to the supply.
See: Section 2 of the Rights of Entry (Gas and Electricity Boards) Act 1954.