At that point he was going down without the dummy but then waking for it after a couple of hours, and then 4 or 5 more times during the night.
First night he went down fine as usual, then woke up for his dummy. We went in to him, consoled him, cuddles, strokes, then went out, then went back in, more cuddles, more strokes, then out, and did that for about an hour until he fell asleep again.
Then similar a couple of hours later.
That was it for night one.
Night two, he only woke for it once, and took a lot less time to settle.
Night three he slept all the way through, or at least if he woke, settled himself straightaway.
So really, from waking 4 or 5 times a night, it was better even night 1, then much better night 2, then completely sorted night 3.