Switching supplier or tariff is one of the few savings that needs no lifestyle change at all, just a bit of admin. The trick is comparing the right things, because the headline price per unit is only part of the story.
Look past the unit rate
A low price per kWh can hide a high standing charge, and the cheapest deal for a heavy user is not the cheapest for a light one. Compare the total estimated annual cost for your own usage, not the unit rate alone. To do that you need your actual annual consumption in kWh, which is on a recent bill or your online account; with that figure a comparison is meaningful rather than guesswork.
Fixed or variable
A fixed tariff locks your unit rate for a term, giving certainty and protection if prices rise, but usually with an exit fee if you leave early. A variable tariff moves with the market, cheaper when prices fall and painful when they climb. Which is better depends on where prices are heading, which nobody truly knows, so it comes down to whether you value certainty or flexibility.
How switching works
Switching is mostly painless and behind the scenes. Your supply does not get cut off, no engineer visits, and the same gas and electricity flow through the same pipes and wires; only the company billing you changes. You provide a meter reading on the switch date so the old and new suppliers split the account correctly, and the process typically completes within a couple of weeks.
Use a genuine comparison
To see real, current deals, use a reputable comparison service that lists the whole market and shows total annual costs for your usage. This site does not publish a live tariff table, because prices change constantly and vary by region, and a stale table would be worse than none. Treat any comparison as a snapshot, and recheck when your fixed term ends rather than letting it roll onto a default rate, which is rarely the best.