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Thank so much for the detailed answer. I think the paint comes off fairly easily, as you say, and in the rest of the house, there are instances of tiny areas of paint flaking, which probably means the people who painted it really didn't wait long enough before painting.
How big an area would you recommend me to scrap off? I just worried about the transition between new and old paint?
! Also, this is probably too small a job to have much interest from a painter right? Mainly asking because wife is 8 months pregnant and getting it right on first straight away would obviously be nice.
Again, thanks so much
plantasia-
You would be lucky to get a painter in. Maybe if you had someone in your street.
I would try to scrape the whole lot to the left of the window off or at least score the paint in a straight line above the highest patch and scrape off below that line. It is the transition that shows but it's easier to fill and feather a straight line than a rough edge.
I use a 50mm scraper blade which is honed through use on plaster walls so it makes it easier to do without gouging. A 6" T handle scraper is likely to get it done fast and ensures you can get the small bits that are well adhered off but it's easier to gouge which means filling and it's not easy to fill small gouges. A plastic handle with a Stanley blade in is the cheapest option. If you're lucky it will fall off and maybe you have a tiny bit of sanding to do for any little bits that stick. I've stripped 20 times that area in 1/2 hour more than once.
If you are not sure the paint is badly adhered then you might want to skim the holes you have with filler, feather with a sponge and then lightly sand and paint. It will probably grin or flash a bit but you are not going to care after 3 months with a baby in the house. :)
good luck & bon courage
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You'll be able to that yourself - just have all the right equipment (you'll invariably forget something/require something else but still), follow the steps and take a bit of time.
Airhead
Tenderloin
I might be reading this wrong because I'm not able to closely examine the wall but it looks as if it was plastered and painted too soon without allowing the plaster to dry properly (that should be 6 months). This is not uncommon these days!
That should allow you to get a scraper with a sharp blade and take all that paint off very easily. Depending on your skill set you will have to fill some little gouges after that process but you should have a plastered wall which you can roll with emulsion, probably water down the first coat as per manufacturers instructions or use Gardz. I would remove the cupboard door and tape plastic over the cupboard while you do this job.
If the paint doesn't scrape off easily you will need to remove the loose stuff and fill with something like TX110 (Toupret) or easifill. I prefer TX110. When you fill it let it dry a little then feather the edges into the wall with a sponge to avoid having to sand too much. It helps a lot if you then use Gardz to stop the filler flashing under the emulsion. It does take some skill to stop this damage showing. I like to line walls like this for clients that want a really fine finish.
I would probably try to repair it this way as you have hopefully fixed the reason it was a problem. If however you have problem with the new paint you'll probably need to paint this wall with an oil based damp resisting paint. I wouldn't go down that route unless you have to because it can complicate things and it's unpleasant to work with especially if you are sensitive to volatile organic compounds.