About Turning left: the wide arc, and three exceptions to 'left-past-left': which statement is WRONG?
Watch for traffic coming up behind you, both before you move into position and again right before you actually turn.
'left-past-left' applies, UNLESS: the oncoming driver has already clearly committed to a turning position, road markings indicate otherwise, or there is a wide central reservation.
When turning left you take the turn just as tight as when turning right, to get onto the new road as quickly as possible.
Here too you give way to both straight-ahead traffic and oncoming drivers turning right.
Explanation
trap: right-turn technique pasted onto a left turn. Book p.138 - when turning left you take the turn wide, so that you land on the right-hand side of the road you enter, and you do not cut the corner