Keep emphasising charge is in the wires already
Teaching Guidance for 11-14
Don't use a model that suggests charged particles come from the battery
It's very easy to say;
Teacher: a current of 1.4 ampere flows from the supply
Teacher: a current of 1.4 ampere is drawn from the supply
Once again these words imply that the current originates in the battery and it is better to say something like
There is a current of 1.4 ampere in the wires of the big loop and in the supply.