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It depends how confident you are in your DIY skills.
If it were my home I'd strip the lining paper off remove the problem plaster and re-skim the walls as it appears that the bonding coat is in decent condition.
If you aren't confident to skim or don't want the expense of getting a spread in it should be possible to get a decent finish with easifill (or whatever toupret product is the equivalent @Airhead will have to enlighten you there). The key to making that work would be to use a large plastering trowel to bridge between the 2 edges of the old plaster, if you don't have a trowel big enough a plasterers rule or darby could be used.
Anything other than this would be kicking a problem down the road.
Bobbo-
We’ve got builders renovating our bathroom in the next week or 2 so they’ll be doing some plastering anyway.
Guess I could hack out the dodgy bits and they could plaster over it to save £££.
How do you remove the lining paper without taking off excess plaster? Soak with water or paint on PVA to dry it out and crack it off?
nankatsu
How can I repair this internal wall and make it straight enough to paint?
Ideally as cheap as poss.
Have removed old built in wardrobe and as expected some of the plaster has come off with it.
It has lining paper on it and if I remove more of the lining paper then more plaster will come off too.
Victorian house, walls dry but spongy/bouncy in areas behind the lining paper.
Don’t think glueing thin MDF or wood onto the current wall is an option,
Could nail it on?
Plasterboard?