Precedent that is not binding on the court; but the judge may consider that it is the correct principle, so he is persuaded that he should follow it. Persuasive precedent may come from a number of sources such as lower courts, "horizontal" courts, foreign courts or statements made in dicta.

Courts lower in the hierarchy

Shown in R v R (1991)(UK) the judge agreed with a court of appeal in deciding that a man could be guilty of raping his wife.

Statements made in obiter dicta

The judge in R v Howe (1987)(UK) ruled that duress could not be used as a defence for murder. The Lords in obiter dicta commented that it shouldn’t be used as a defence for attempted murder. When later in R v Gotts (1992)(UK) attempted murder defence used duress as a defence. The Obiter statement was used as persuasive precedent by C/A In law, the term dicta is used to refer to a judges statement of legal opinion that is not directly relevant to the case being heard. ...

A Dissenting judgement

A judgment heard by a tribunal, and one judge dissented from the decision. The judge in the next case can decide to follow the dissenting judge’s obiter and rationale.

Courts in other countries

So where other countries use the same ideas of common law as us. Applies in the commonwealth e.g. Canada, Australia and New Zealand and to some extent in the USA.