RAF Good Conduct Badge/Chevron

Good day Folks

A question.

An old RAF veteran in the village is trying to put together an RAF uniform. He tells me that he was entitled to a Good Conduct Chevron worn low down on the sleeve. He tells me that these were issued but that after the war their use was discontinued. He also says that his memory isn't that good now so he may be mistaking it for something else.

Can anyone confirm the existence of these and if his memory is correct where can I get one for him?

Many thanks

James