Currently on the British Gas Price Promise Tariff for dual energy costs but looks like there is a cheaper one now on there* called the Fixed Tariff 12m which (for me anyway) would be almost a £50 annual saving to change.
Might be of use to others to at least look into if they're with British Gas.
*This may have been on there for ages, it may be a rubbish deal and I may be talking crap.