I think it's fair to say that the offence of personation is fairly broad in scope. Some of the conduct you've described may technically fall within the offence of personation. What we could say in response to that is simply that this offence is one that tends to be charged quite infrequently. We would rely on the excellent discretion of the police across the country and prosecution authorities to consider the advantage for which someone might have pretended to be someone else. If it is merely a matter of, “I forgot my driver's licence and just in case I was stopped I wanted to have a driver's licence with me,” we would not expect to see a prosecution.
On September 17th, 2009. See this statement in context.