Hi Iain,
Sounds like a lot of lifesavers, be careful of looking around too much!
What we teach, which is adequate is the following and I hope this helps.
Minor to Major T-Junction Right and Left turns
On approach, Mirrors Signal Manouvre MSM then Position Speed Look PSL
2 options are stop and give way.
Lifesaver should only be needed if you have stopped at the junction, and this is then aimed towards the direction you are travelling, however before you set off. For instance turn left lifesaver to the left, and turn right lifesaver aimed towards the right.
Major to Minor Right and Left turns
On approach use the MSM PSL routine!
Left turn, consider a lifesaver for position change, if its a wide road, and consider a left lifesaver before entering the minor road, if you see pedestrians, or possibly a cycle lane!!
On approach use the MSM PSL routine!
Right turn, consider a lifesaver for position change, and most definately a lifesaver to the right before turning on both options of stop and give way!!
The important consideration is to be able to act sensibly on what you see, therefore the timing of any observations should be before you comitt to your manouvre!
Also never say never, if in doubt always have a look
Hope this helps!