Sorry should have given more detail.
I drive a Honda Accord 2.0 Exec sport (t plate).
It happens as soon as the indicator is put on and stops as soon as I switch it off. Just one of those annoying things.
Will invest in some ear plugs or a decent stereo system. I have tried only turning left but the wife wasn't very happy taking 30mins to get home from a 5min journey with frozen food in the boot!!!

Thanks x