Do you have to have gas and electricity with Avro energy?

Do you have to have gas and electricity with Avro energy?
All Avro Energy tariffs must be taken out as dual fuel, which means you cannot sign up for gas or electricity individually. If you want Avro Energy to supply your energy, it will supply gas and electricity rather than one or the other. All Avro Energy tariffs are also available as Economy 7 tariffs.
Is there an exit fee for Avro energy?
From our research, we found a lot of review sites reporting that Avro Energy does not have exit fees. This is not true! While the majority of Avro Energy tariffs do not have exit fees, we found a few that do. Currently, the Simple and ReSuper12M and the Simple and GoFixed tariffs have a £30 exit fee per fuel.
What happens if I leave Avro energy tariff?
If your fixed-rate Avro Energy tariff ends and you do not take out a new tariff or switch to another supplier, you will automatically be put on this tariff. Since this is a variable tariff, you are not tied into any contract and can leave anytime without facing a financial penalty.