@mikey
//I hope that is clear now.....it would be so much easier if I could draw a diagram and put it on here !//
I know what you mean. Someone recommended Skitch for scribbling what you mean on charts or photos but I've not even begun to try it (nothing requiring it yet).
But I do get what you meant now, thanks. If you'd said "sideswipe maneuvre", I'd have understood immediately.
Does anyone use the phrase "positional indication"? To me, taking right hand lane at the roundabout is an overt declaration that you're taking an exit to the right of straight ahead. I all but cease paying attention to the vehicle to my right. If it hits me without indicating or gives only a fraction of a second's left indicator then the claim should be interesting.
It is frustrating when an opportunity to set off from the entry give way is lost because someone takes that exit without indicating left but that's just a minor niggle and has zero danger if their ambiguous course/intention obliges you to continue to wait. Indeed second-guessing other drivers is probably what leads to some accidents.