What Ward's evidence suggests, which has been in the air for a long time, is that Gareth Jenkins was not actively seeking to provide perjured evidence for some reason but he was being steered/coerced into it, in some cases as a result of being put under pressure by Post Office, while knowing that pushing back could have caused him problems with his employer.
Jenkins shouldn't have provided perjured evidence but if he is prosecuted it will need to be a case recognising this nuance.