The Highway Code

Sometimes buildings, hedges, bends and other obstacles can obscure your view. Move forward slowly until you see the road clearly before you pull out.

You can wait in a yellow box junction if you want to turn right and are stopped from doing so by oncoming traffic, or by other vehicles waiting to turn right.

Some traffic-light-controlled junctions have advanced stop lines to allow cycles to be positioned ahead of other traffic. 
Motorists, including motorcyclists, MUST stop at the first white line if the lights are amber or red and should avoid blocking the way or encroaching on the marked area. 
If your vehicle has proceeded over the first white line at the time that the signal goes red, you MUST stop at the second white line, even if your vehicle is in the marked area. Allow cyclists time and space to move off when the green signal shows.

At an unmarked crossroads no one has priority. If there are no road signs or markings do not assume that you have priority. Remember that other drivers may assume they have the right to go. No type of vehicle has priority but it’s courteous to give way to large vehicles. Also look out in particular for cyclists and motorcyclists.

You can stop in a yellow box junction if you want to turn right and are stopped from doing so by oncoming traffic, or by other vehicles waiting to turn right.