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British Gas - Wikipedia
About us - British Gas
British Gas - Centrica Plc
Big Six in the UK - statistics & facts | Statista
Centrica and British Gas - statistics & facts | Statista
British Gas: Company history and facts - Numbers
Our History - Centrica Plc
Centrica - Wikipedia
Centrica's profit doubles as British Gas takes on 700,000 customers
British Gas - BBC News