Thanks for the reply. When he was newborn he only went 1-1.5 hours between feeds and we slowly increased him to 3 hours. He was taking 7oz at bedtime (6pm) and going thru til 2am then feeding and going thru til morning (5am, yawn), dreamfeeding didn't work with him, he'd only take an oz and then still wake at 2/3am for his normal full bottle. I may try creeping him out to 4 hours, but keep an eye on his weight.
He is very unsettled over night, waking for no apparent reason and resettling with the dummy. Our plan is to use pu/pd to get rid of the dummy and hopefully solve the waking. I'm not sure it will work as I know he settles without the dummy sometimes and will still wake in the night for no reason.