If you were using a Toucan and wishing to turn left onto the immediate carriagway, or travel over the road to turn right on the other carriageway, you are perfectly correct to do so, unless expressly forbidden to turn left or right by signage.
Depending on the layout of the crossing there would probably be an element of giving way to pedestrians crossing the street onto which you are turning, but that's just common sense, and probably the law.
Does rule 170 apply to bikes as well as cars? Probably never actually an issue, since bikes are not well known for wantonly accelerating towards pedestrians to 'teach them a lesson'.