Unless there is an emergency such that there is a danger to life or property they can only enter with your permission. However, if you refuse they may apply to a Magistrate for a warrant authorising them to enter. They are entitled to ask to enter your home, or to apply to a magistrate for a warrant, in order to:
• Inspect, substitute, re-install a meter (including a pre-payment meter).
• Add, alter or repair supply lines or pipes and other fittings.
• Remove from a pre-payment meter money or tokens belonging to the supplier.
• Inspect any other fittings.
•Disconnect the supply or remove a meter or other fittings in certain circumstances.
In order to obtain a warrant, the official must show that :
• You have been given at least twenty-four hours' notice (except in certain circumstances where at least 2 or 5 days or up to a week may be required );
and
• He or she has asked to be admitted and you have refused; or
• The premises are unoccupied.
Entry must be at a reasonable time and the official must leave the house as secure against trespassers as it was when he or she arrived , and make good any damage caused .
It is a criminal offence intentionally to obstruct a person who has a warrant or who asks to be admitted in an emergency. The maximum penalty is a fine of £1000. It is not an offence to refuse to let the official enter if there is no emergency and the official does not have a warrant.
The law governing these powers of entry is to be found in the Rights of Entry (Gas and Electricity Boards) Act 1954 and various schedules to the Gas Act 1986 and the Electricity Act 1989.