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Thanks Panic Button.
Because I was trying it out for first time on a 50 mile route I knew well, being told I was joining the motorway when it was a fast dual carriageway wasn't a problem, as I knew it was a mistake. But if I am in unknown territory and joining a large island with many exits, which include motorways, it might be more confusing as althoughj the voice may tell you to take say the third exit (a dual carriageway) if it then said and join the motorway, it would be easy to opt for the motorway thinking the exit number info was perhaps wrong. No doubt I will get used to it.