There are four things that you should do in respect of your gas and electricity supply, when moving home.
If you do not tell your supplier that you are moving, you may be liable for the bills at your old address. You could be liable until the earlier of 2 days after you notify your supplier that you have moved, or the date that the meter at your old address is next read, or the date the new occupier(s) enter into a contract with a supplier for the supply at the old property.
Unless you have arranged for a new supply at your new address, the previous occupant's supplier will automatically provide you with a supply under a 'deemed' contract. You will, by default be placed on a 'deemed tariff' with that supplier, which is either their standard credit rate or a specially inflated tariff which could be 30% more expensive than that supplier's most competitive offer. It is very much in your own interests to ensure that this does not happen, as you will end up over-paying for your energy when you move home.
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Keep a note of meter readings and the dates on which they were taken, for both your old and new properties, in case you do not agree with your bills.
If you are feeling helpful, tell the people moving into your old home the name of the gas and electricity supplier to your old property. If you can, also provide them with the property's Gas and Electricity Meter Numbers. This will help them switch to a cheaper energy deal and prevent them over-paying for their energy when they move in.
Prepayment meters are typically the most expensive way of getting your gas and electricity, and the choice of tariffs to choose from is still limited. Contact the current supplier for advice on having these meters replaced with standard 'credit'-type meters. There may be a charge for this.