You can switch as often as you like! There's no limit to how many times you can find a better deal.

Keep in mind that if you're on a fixed deal, you might have to pay an exit fee if you leave early. But even with an exit fee, switching could still save you a lot of money. You won't have to pay an exit fee if you switch within 49 days of your fixed deal ending, or if you're on a standard variable tariff.