Anyone who is in debt to their supplier or is a tenant will need to follow a different process for switching.
Follow this link for more information:
Citizens Advice Get a Better Energy Deal.
Householders should find out if their existing contract has an 'exit fee' for leaving early - it's usually
on their bill.
Householders who have a smart meter will need to check their new supplier supports smart meters before they
switch. You can still switch if it is going to be cheaper for you, however, you may have to go back to manual meter
People who get the Warm Home Discount (£140) must check whether their new supplier offers the
Warm Home Discount before they switch -
they'll lose it if they don't.
Anyone who has applied for the Warm Home Discount but not yet got it will have to apply again if they switch
supplier - they should check if their new supplier has different rules about who gets it.