They've come back but varying every night.
We pushed his bedtime back to 7.15iah and that first night he slept all the way to 6am then resettled and slept until 7.40.
Yesterday he only had a nap of an hour in the pm and couldn't get him to resettle and he went to bed 7.15 so awake 2 hours 45 before bedtime (same as night before) and woke 3am but had to go to him a few times within the hour then 6.40am.
During the wake ups it varies. Sometimes I'm not sure he's awake. His eyes are closed and whinging with the odd wail and tossing side to side, sometimes rubbing his eyes.
If he wakes around 6 usually eyes open but he falls back to sleep.
Thank you for all your help!