You are correct that this would be very relevant in the case of any court proceedings where liability hinged on whether a road user on an empty road indicated before changing lane, when there is nobody around who would benefit from the signal.purplepolly said:"Although failure to comply with the other rules of the Code will not, in itself, cause a person to be prosecuted, The Highway Code may be used in evidence in any court proceedings under the Traffic Acts (see 'The road user and the law') to establish liability. This includes rules which use advisory wording such as ‘should/should not’ or ‘do/do not’.
I'm relying on you to think of such a scenario, though, because I can't.