Overtaking on the left tends to get called 'undertaking', which is a service you may require if you do it too often

I seem to recall that you can overtake on the left here only if the vehicle in front has indicated that it is turning right, or if the entire lane of traffic to your right is moving slower, e.g. in a traffic jam, or if the lanes are filtering traffic in different directions. (Although I'm quite prepared to be humiliated and told I'm wrong)

Where did I leave that copy of the Highway Code???

Geoff
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Got one of the first Mark 2 empegs...