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You are spoilt for choice these days. I would start with Zinsser 123+ primer/undercoat, then coat of system undercoat from whichever manufacturer you settle on. 2 other good manufacturers are :-
Little Green
Benjamin MooreIf you are going to a decent supplier like papers and paint in Chelsea they can advise you regarding the latest alkyd paints. They are very expensive but are the best water based paints I've used so far. Not brands I recognise but there are a few coming through with near perfect paints. Benjamin Moore are very good too.
Then decide if you brushing or rolling. I'm settling on rolling for eggshell acrylic these days.
@Bobbo and @Airhead any recommendations for interior wood paints? We are looking for something with good coverage and minimal VOC content and low odour for nursery furniture. What are your thoughts on these:
https://frenchicpaint.co.uk/collections/nursery-furniture-paint
https://www.lakelandpaints.co.uk/wall-paint/nursery-paint/nursery-paint/
https://www.farrow-ball.com/our-finishes/interior-wood-metal