So! Here's the summary
8pm Down awake after bath, feed, story, put into cot awake. Drifted off within 15 mins, a bit of chatting but no shouting. BIG WIN!
9pm Awoke crying. 50 mins in total :(. Me and then DH with him, cuddling, patting, shushing, murmuring etc. lullabies and star projection thing. Asleep before 10pm
11pm Awake. As per plan I fed him straight away. Put him down just still awake after 10 mins, asleep within 1 minute.
1am Awake crying. As above, I sat with him shushing, patting, cuddling etc. lullabies and star projection. Long pauses by 1.30. Fell asleep at 1.45 for 2-3mins, shook himself awake and howled. Fell asleep at 2 for 2-3 mins, shook awake and howled. Finally asleep at 2.15am
5.15am Awoke. Fed as per my plan. Put him down awake, switched on stars and left him. Don't know how long he took to go to sleep but he slept until 8am
8am Awoke cooing and happy. Curtains opened, nappy and clothes change then downstairs for a feed.
Positives: A couple of good stretches of sleep and 6 hours between feeds. Will happily drift off after a feed so doesn't need feeding to sleep.
Negative: two long sets of howling. But we didn't leave him at any point and were very reassuring, gentle, consistent. I suspect he was upset because he was confused and wondering where my breast was rather than feeling abandoned so I felt bad about it but much better than leaving him to cry.
We'll plough on. Even with the 1 1/4 hours at 1am I still had way more sleep than usual including a blissful 3 hours between 2.15 and 5.15. And sleep was better because my bed is so much cosier than the guest bed and I wasn't aware of DS's every snuggle and shimmy! And DS had way more sleep than usual too which is brilliant for him.
I don't care about him sleeping through. To be frank I can easily cope with 11, 1 and 5 if I have to as that is do much better for us both than what we've been living with.
Thank you so much for the advice. If has helped to clarify things whereas I never quite listened to advice ob my other threads, or felt less hopeful. I wouldn't move him into his own room until he reached 6m so this has been the right time to start this big effort.
I'm going to get this thread moved to Sleep so it doesn't go poof so that I can refer back to it if needed, or point others to it.
Thank you all! I'll update you over the next few days.
The main thing is having a strong pre-bed and morning routine to book end sleep with which mirrors what we did with the others but has somehow felt impossible with this one. And we are both now in the best sleeping places.