Before agreeing on a contract, contact the supplier you already must see what they can offer compared to other providers. You can use a comparison website or phone different energy suppliers to see what other providers are offering.
You can also use energy brokers who can negotiate a contract for a fee. If you use a broker:
Ask which suppliers they represent so you know if they can offer a full-market comparison.
Make sure you are clear on the terms of their service. For example, they may charge a one-off finder’s fee or integrate their fee as part of a commission agreement in a contract you choose to sign up to. See GOV.UK’s advice on https://www.gov.uk/unfair-terms-in-sales-contracts
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