Thank you! :)
Comfortable
Make sure your toddler is comfortable - doesn't need a wee, isn't hungry or thirsty, not too hot or cold etc etc.
--- Yes, all good points, and most of the time covered off I believe.
Calm
TV/screens off half an hour before bedtime (at least). Calming story & cuddles before bed. Low, whispering, even toned voices.
--- He doesn't watch TV other than the single 2 minute youtube clip on occasion. Cuddles, story tick tick. Was anti even using youtube but it does seem to snap him out of the angry state like nothing else, and he doesn't just go straight back angry again after. I am pretty anti TV (like my Mum was/is), but I'm not so sure these youtube clips are a bad thing... they seem to calm him.
Quiet/Dark
Blackout blinds. Maybe a night light or leave the door open (and landing light on) for reassurance, but no stimulating light show things. No music, videos, noise (maybe apart from white noise, which some children like).
---blackout blinds tick. landing light tick, light show on or off doesn't seem to make much difference, but i agree i don't think it is a help.
Reassurance
The only method you mentioned involving your presence there for reassurance is one which means you ignore the child. How about you stay and give reassurance? Sit next to the cot and stroke his face, pat his back, tickle his hand - whatever to provide reassurance of your presence. Stay until asleep. Gradually, over time (we are talking months, not weeks) reduce the reassurance you need to give until just your presence is reassurance enough. Then just knowing you are upstairs is enough. Until the child feeds secure enough to sleep on own.
--- yes sorry, we have tried all combinations of this. sometimes he gets so angry that it makes him more angry to be patted, or stroked!
Thanks for all this