An energy supply company has a special 12-month deal for new customers: 34% off electricity if paid on time & 20% off gas under the same criteria. My current supplier offers 13% off power & 14% off gas if paid on time.
The new offer is most attractive for electricity supply but offers no savings for gas.
When the email info pack is received, I have a 10-day cooling-off period, plenty of time to research any differences.