Thanks garrymartin, & kandgmitchell
the visibility splays were not correct, I have adjusted them... but its tight.
Speed survey may work as currently cars parked on the road forces traffic to stop and give way. although if the road is clear then often people are over the speed limit as its quite a rural, and you can see quite far up and down the road.
The adjacent land is not used. if there were no obstructions, but the splays still passed over it slightly would i still have to have some sort of agreement?
In short I think it will be very difficult without removing the hedges on both sides to make the visibility splays work although depending where the channel can actually be measured from, the splays only just cut across the front of the hedges... if they were not overgrown, they may work...
a lot could depend on how accurately they check measurements etc, and where they are taken from