British Gas
UK’s largest and longest-established supplier
Pros
- UK’s largest supplier with the biggest engineer network
- Long-established, widely recognised brand
Cons
- Scored below 60% in Which?’s 2026 customer satisfaction survey
Why consider British Gas
British Gas is the UK’s largest and longest-established energy supplier, with over two centuries of history and one of the biggest engineer networks in the country — useful if fast, widely-available call-out support matters to you.
How switching works
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Frequently asked questions
Does British Gas offer emergency call-outs?
Yes — its scale means British Gas typically has the widest engineer availability of any UK supplier, useful if fast call-out response matters to you.
Is it free to switch energy supplier?
Yes — switching suppliers in the UK is free, and by law your physical energy supply is never interrupted during a switch.
How long does switching take?
Typically around 3 weeks from agreeing to switch to your new supplier taking over, though some suppliers offer faster switches.
Will I lose supply while I switch?
No — the gas and electricity itself doesn’t change, only who bills you for it. No engineer visit or physical work is needed at your property.
Can I switch if I’m on a fixed-term contract?
Usually yes, penalty-free, if your current term ends within 49 days. Switching earlier may trigger an exit fee — worth checking your current contract first.
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