'To be capable of amounting to corroboration the lie told out of court must first of all be deliberate. Secondly it must relate to a material issue. Thirdly the motive for the lie must be a realisation of guilt and a fear of the truth. The jury should in appropriate cases be reminded that people sometimes lie, for example, in an attempt to bolster up a just cause, or out of shame or out of a wish to conceal disgraceful behaviour from their family. Fourthly the statement must be clearly shown to be a lie by evidence other than that of the accomplice who is to be corroborated, that is to say by admission or by evidence from an independent witness.'