It is not what I am saying, this is what the Highway Code advises. It is a requirement that indicators are used to signal your intentions to other road users. The Highway Code then advises, that even though a vehicle may be indicating, does not mean that they will turn. I would suggest you read the Highway Code. The examples that are given are indicators being used to early, and someone turning into a junction passed where you are positioned, or it may even be that the indicators have not been cancelled. This is also covered quite a substantial amount of case law.